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XV Hadron Physics 2020

Report of Contributions

https://indico.in2p3.fr/e/19502

XV Hadron Physi … / Report of Contributions Gravitational waves signatures an …

Contribution ID: 5 Type: Seminar

Gravitational waves signatures and magnetars

A neutron star was first detected as a pulsar in 1967. It is one of the most mysterious objects in theuniverse, with a radius of the order of 10 km and masses that can reach two solar masses. In 2017,a gravitational wave was detected (GW170817) and its source was identified as the merger of twoneutron stars. The same event was seen in X-ray, gamma-ray, UV, IR, radio frequency and evenin the optical region of the electromagnetic spectrum, starting the new era of multi-messengerastronomy [1]. To understand neutron stars, an appropriate equation of state that satisfies bulknuclear matter properties has to be used [2] and GW170817 has provided some extra constraintsto determine it [3].

On the other hand, some neutron stars have strong magnetic fields up to 1015 Gauss on the surfaceas compared with the usual 1012 Gauss normally present in ordinary pulsars. They are calledmagnetars. While the description of ordinary pulsars is not completely established, describingmagnetars poses a real challenge because the magnetic fields can produce an anisotropic equationof state. One elegant way to circumvent this problem is the use of the chaotic field approximation[4].

It is also known that low magnetic fields do not affect the equation of state and the resultingstar macroscopic properties but they do affect the crust-core transition and the crust thickness [5]with many consequences, as the explanation of glitches and the calculation of the Love number thatenter the quadrupole tidal polarisabilities. Moreover, just before the merging, tidal interactions canexcite the star crust fluid modes by resonance and the fundamental mode can be greatly excitedwith a strong influence on the gravitational wave emission [6].

I will talk about the importance of the new constraints imposed by GW170817 in the determinationof appropriate equations of state, in the calculation of the fundamental mode and possible ways todescribe hadronic and quark matter subject to strong magnetic fields.

[1] P. S. Cowperthwaite et al. (Ligo Scientific Collaboration and Virgo Collaboration), Astrophys.Jour. Lett. 848: L12 (2017).[2] M.Dutra, O.Lourenço, S.S.Avancini, B.V.Carlson, A. Delfino, D. P. Menezes, C. Providência, S.Typel, and J. R. Stone, Phys. Rev. C 90, 055203 (2014).[3] Odilon Lourenço, Mariana Dutra, César H. Lenzi, Cesar V. Flores and Débora P. Menezes, Phys.Rev. C 99, 045202 (2019).[4] L. Lopes and D. Menezes, Journal of Cosmology and Astroparticle Physics 08 (2015) 002; D.P. Menezes and L. L. Lopes, Eur. Phys. J. A 52 (2016) 17; Luiz L. Lopes and D.P. Menzes, arXiv1909.05400.[5] Debarati Chatterjee, Francesca Gulminelli and Débora P. Menezes, Journal of Cosmology andAstroparticle Physics 03 (2019) 035.[6] Cesar V. Flores, Luiz L. Lopes, Luis B. Castro and D.P. Menezes, arXiv:1905.11170.

Primary author: Prof. P. MENEZES, Débora (UFSC)

Presenter: Prof. P. MENEZES, Débora (UFSC)

Session Classification: Seminars

December 27, 2020 Page 1

XV Hadron Physi … / Report of Contributions Strong Interactions and Fundamen …


Strong Interactions and Fundamental Symmetries

Effective field theories allow us to track the violation of symmetries across energy scales. I will dis-cuss the manifestation in nuclei of the lowest-dimension interactions beyond the Standard Modelwhich violate lepton number, baryon number, and time reversal. Specific processes/quantities in-volved include neutrinoless double-beta decay, the deuteron lifetime, and electric dipole momentsof the neutron and light nuclei.

Primary author: Dr VAN KOLCK, U. (IPN Orsay)

Presenter: Dr VAN KOLCK, U. (IPN Orsay)



XV Hadron Physi … / Report of Contributions Low energy constituent quark cou …


Low energy constituent quark couplings from adynamical approach

Recent work on the derivation of light quark-antiquark mesons couplings to baryon’s constituentquarks will be presented by starting from a quark-quark interaction mediated by one non-nonperturbativegluon exchange. Some well known methods are considered and they provide complete well knowneffective models with their parameters such as coupling constants, and also form factors and av-eraged quadratic radii. These quantities are written in terms of components of quark and non per-turbative gluon propagators, of the quark-gluon (running) coupling constant and u and d quarkmasses. Among the resuling couplings there is a whole constituent quark Large Nc EFT proposedby Weinberg with its electromagnetic couplings. Light vector and axial mesons couplings to con-stituent quarks and to the photon are also obtained in such dynamical way. Some effects of arelatively weak magnetic field on all these couplings may be shortly addressed. The constituentquark-level Goldberger Treiman and the GellMann Oakes Renner relations are obtained amongother new relations.

Primary author: Dr BRAGHIN, Fabio L. (IF-UFG)

Presenter: Dr BRAGHIN, Fabio L. (IF-UFG)



XV Hadron Physi … / Report of Contributions NN short-ranged correlations: Fro …

Contribution ID: 9 Type: Lecture

NN short-ranged correlations: From Theory toExperiment in 65 Years

The physics of short-ranged correlations is reviewed from a pedagogical standpoint that is aimedto provide background sufficient for students to do research in the field. The lectures discuss:

1) how the earliest efforts allowed physicists to understand the qualitative features of nuclearbinding and saturation.

2) the technical improvements, including relativistic effects

3) short-range correlations in the context of effective field theory

4) recent experimental findings related to short range correlations

5) future prospects

Primary author: Prof. MILLER, Gerald (University of Washington)

Presenter: Prof. MILLER, Gerald (University of Washington)

Session Classification: Lectures


XV Hadron Physi … / Report of Contributions Pion off-shell electromagnetic for …


Pion off-shell electromagnetic form factors fromdata analysis

The light mesons, like pion, play special rules in try to understanting QCD, between another moti-vation, the pion is the Goldstone boson, and, is central to symmetry breaking and partial currentconservation(PCAC). The most general way to take informations about the hadronic substructure, i.e.; in termsof the degrees of freedom from QCD, quarks and gluons, are the study of the electromagnetic formfactors. The electromagnetic form factors play also, fundamental importance in order to studingprocesses involving hadrons and virtual photons. Because the pion have spin zero, and, with thetime-reverse invariance, we need only one electromagnetic form factor to describe the pion. Still,general approaches about electromagnetic form factors for pseudoscalar particles, not take in ac-count off-shell effects.But in order to be more consistent, and go beyond on-shell,the off-shell effects is need be included at the electromagnetic interactions [1].The possible off-shell effects, also appear in meson pionexchange current [2], because in that case, the exchanged pion isnot on-mass shell. The most general electromagnetic description for the pion, need two electro-magnetic form factors, F1(q

2, t), and, F2(q2, t),

wich are related the Ward-Takahashi identity [3].Ward-Takahashi identity was explore some years ago for the boson case in thereference [4] with the light-front approach.The electromagnetic off-shell form factors was been calculated for the bosonbound state, and, in that work, is realized, the zero modes inclusionis crucial to preserve the Ward-Takahashi indentities with theLight-front Field Theory. However, microscopic modelis not already made to incorpore off-shel effects at the vertex,and extract the off-shell form factors.In the present work, we explore the electromagnetic off-shell effects for thepion meson and extract the off-shell electromagnetic form factors,F1(q

2, t) and F2(q2, t), from experimental electroproduction cross section data [5,6].

However, the extraction of the electromagnetic form factorwith the reaction 1H(e, e′, π+)n, need some model for the GπNN (t) form factor,here, we explore some possibilities for this form factor.The differents models are explored, in order to see the power predictions for that models, withrespect the pion observables, like, electromagnetic form factors, electromagnetic radius and, also,the pion electroweak decay constant.References

1. H. M. Choi, T. Frederico, C. R.~Ji and J. P. B. C. de Melo.Pion off-shell electromagnetic form factors: data extraction and model. arXiv:1908.01185[hep-ph].

2. F.Gross and D. O. Riska, Phys. Rev. C36, 1928 (1987).

3. Lewis H. Ryder, Quantum Field Theory, Cambridge University Press.

4. H. W. L. Naus, J. P. B. C. de Melo and T.Frederico, Few Body Syst. 24, 99 (1998).

5. H. P. Blok et al., [Jefferson Lab Collaboration], Phys. Rev. C78, 045202 (2008).

6. G. M. Huber et al., [Jefferson Lab Collaboration],Phys. Rev. C78, 045203 (2008).


XV Hadron Physi … / Report of Contributions Pion off-shell electromagnetic for …

Primary authors: DE MELO, João Pacheco (Laboratório de Física Teórica e Computacional - UCS- UNICID); Dr CHOI, Ho-Meoyng (Kyungpook Natl. U., Daegu); JI, Chueng (North Carolina StateUniversity); Prof. FREDERICO, Tobias

Presenter: DE MELO, João Pacheco (Laboratório de Física Teórica e Computacional - UCS - UNI-CID)



XV Hadron Physi … / Report of Contributions Heavy ion and fixed target physics …


Heavy ion and fixed target physics at the LHCbexperiment

The LHCb experiment explores the heavy ion and fixed target physics using some of its specificfeatures. Particle production of particles, notably heavy flavour states, can be studied at LHCenergies in the forward rapidity region, providing complementary measurements to the other LHCexperiments. An overview of these results obtained on the LHCb heavy ion program will be given.

Primary authors: RANGEL, Murilo (LAL); COLLABORATION , LHCb

Presenter: RANGEL, Murilo (LAL)



XV Hadron Physi … / Report of Contributions Mixing and quark mass dependenc …


Mixing and quark mass dependence of axial vectormesons in the Coulomb gauge QCD model

We discuss properties of axial-vector mesons within an effective version of Quantum Chromody-namics in the Coulomb gauge. While recent studies have put emphasis in configuration mixingwith open meson-meson channels, we here concentrate on the simpler closed-channel problemand follow the 1+ mixing through a wide range of quark masses. We also examine their radialexcitationsand discuss with them the concept of insensitivity to chiral symmetry breaking.

Primary author: ABREU, Luciano (Federal University of Bahia (Brazil))

Presenter: ABREU, Luciano (Federal University of Bahia (Brazil))



XV Hadron Physi … / Report of Contributions Multiquark state: from meson and …


Multiquark state: from meson and baryons to exotictetraquarks and pentaquarks.

I will review quark models for baryons and mesons and the experimental results as starting toolsto understand hadron spectroscopy and structure. Then I will focus on the evolving theoreticalmethods and on the experiments planned at future hadron and lepton colliders, to explore this verylively field of research initiated fifteen years ago with the discovery of Ds0(2317) and X(3872) andin particular to review recent theoretical work on Exotic Hadrons (tetraquarks and pentaquarks)and original contributions from several groups. Finally, particular attention will be devoted to theemerging field of hadrons with heavy quarks (non-exotic and exotic).

Primary author: SANTOPINTO, Elena (INFN)

Presenter: SANTOPINTO, Elena (INFN)



XV Hadron Physi … / Report of Contributions The interaction of bottomonium ϒ …

Contribution ID: 15 Type: Poster

The interaction of bottomonium ϒ with a hadronicmedium

Abstract: Heavy mesons play an important role to understand the properties of strongly interact-ing matter. Quarkonia that survived after the quark-gluon plasma phase are expected to collidewith other particles that constitute hadronic matter. In this work, we present a study on the inter-actions of the Υ meson with a hadronic medium. The meson-meson interactions are described byan effective Lagrangian that is based on SU(4) symmetry, within the framework of unitarized cou-pled channels projected onto s-waves. The symmetry is explicitly broken to SU(3) by suppressionof the interactions driven by bottomed mesons. We calculate the cross sections for Υ scatteringby light pseudoscalar and vector mesons, as well as their inverse processes. The most relevantchannels are evaluated and a comparison of the findings with existing literature is performed.

Primary author: Mr VIEIRA, Hildeson (Universidade Federal da Bahia)

Co-author: ABREU, Luciano (Federal University of Bahia (Brazil))

Presenter: Mr VIEIRA, Hildeson (Universidade Federal da Bahia)

Session Classification: Posters


XV Hadron Physi … / Report of Contributions Diffusion of conserved charges in …


Diffusion of conserved charges in relativistic heavyion collisions

The bulk nuclear matter produced in heavy ion collisions carries a multitude of conserved quan-tum numbers: electric charge, baryon number and strangeness. Therefore, the diffusion processesassociated to these conserved charges cannot occur independently and must be described in termsof a set of coupled diffusion equations. This physics is implemented by replacing the traditionaldiffusion coefficients for each conserved charge by a diffusion coefficient matrix, which quantifiesthe coupling between the conserved quantum numbers. The diagonal coefficients of this matrixare the usual charge diffusion coefficients, while the off-diagonal entries describe the diffusivecoupling of the charge currents. In this seminar, we provide the first calculation of this diffusioncoefficient matrix for a hadron resonance gas and a gas of partons. In order to provide some in-sight on the influence that the coupling between the net charge diffusion currents can have onheavy ion observables, we present first results for the diffusive evolution of a hadronic system ina simple (1+1)D-fluid dynamics approach.

Primary author: SILVEIRA DENICOL, Gabriel (Universidade Federal Fluminense)

Presenter: SILVEIRA DENICOL, Gabriel (Universidade Federal Fluminense)



XV Hadron Physi … / Report of Contributions Self-consistent Modelling of Nucle …


Self-consistent Modelling of Nuclear Processes inSolar Flares using FLUKA

We use the Monte Carlo particle physics code FLUKA to calculate gamma-ray spectra expectedfrom solar flare energetic ion distributions. The FLUKA code includes robust physics-based modelsfor electromagnetic, hadronic and nuclear interactions, sufficiently detailed for it to be a usefultool for calculating nuclear de-excitation, positron annihilation and neutron capture line fluxesand shapes, as well as ~GeV continuum radiation from pion decay products. We show nuclearde-excitation gamma-ray line model spectra from a range of assumed primary accelerated iondistributions and find them to be in good agreement with those found using the code built byRamaty and collaborators, currently one of the main tools for the analysis of solar flare gamma-ray data. We also show full gamma-ray model spectra which exhibit all the typical structures ofgamma-ray spectra observed in solar flares. From these model spectra we build templates whichare incorporated into the software package Objective Spectral Executive (OSPEX) and used to fitthe combined Fermi Gamma-ray Burst Monitor (GBM)/Large Area Telescope (LAT) spectrum ofthe 2010 June 12 solar flare, providing a statistically acceptable result. To the best of our knowledge,the fit carried out with the FLUKA templates for the full gamma-ray spectrum can be regarded asthe first attempt to use a single code to implement a self-consistent treatment of the several spectralcomponents in the energy range from ~ 100s keV to ~100s MeV.

Primary author: Dr SZPIGEL, Sergio (Centro de Rádio-Astronomia e Astrofísica Mackenzie (CRAAM),Escola de Engenharia, Universidade Presbiteriana Mackenzie)

Co-authors: Dr MACKINNON, Alexander (School of Physics and Astronomy, University of Glas-gow, Glasgow); GIMÉNEZ DE CASTRO, Carlos Guillermo (Centro de Rádio-Astronomia e AstrofísicaMackenzie (CRAAM), Escola de Engenharia, Universidade Presbiteriana Mackenzie); Dr SIMÕES, PauloJosé Aguiar (Centro de Rádio-Astronomia e Astrofísica Mackenzie (CRAAM), Escola de Engenharia, Uni-versidade Presbiteriana Mackenzie); Dr TUSNSKI, Daneele Saraçol

Presenter: Dr SZPIGEL, Sergio (Centro de Rádio-Astronomia e Astrofísica Mackenzie (CRAAM),Escola de Engenharia, Universidade Presbiteriana Mackenzie)



XV Hadron Physi … / Report of Contributions Hyperon electromagnetic form fac …


Hyperon electromagnetic form factors at large q2

We present calculation of the hyperon elastic form factorsfor the baryon octet for large four-momentum transfer squared,q2, in the timelike region (q2 > 0).Our calculations are based on a covariant quark modeldeveloped in the spacelike region (q2 < 0)and on asymptotic relations between thespacelike and the timelike regions.Those asymptotic relations are derived based onanalyticity and unitarity.Our estimates compare well with the integratedcross section data measured at BaBar, BES III and CLEO.

Primary authors: Dr RAMALHO, Gilberto (Universidade Cruzeiro do Sul); Prof. PEÑA, MariaTeresa (Universidade de Lisboa); Prof. TSUSHIMA, Kazuo (Universidade Cruzeiro do Sul)

Presenter: Dr RAMALHO, Gilberto (Universidade Cruzeiro do Sul)



XV Hadron Physi … / Report of Contributions Low-Q2 parametrizations of the …


Low-Q2 parametrizations of the γ∗N → N ∗ transitionamplitudes

The electromagnetic structure of the nucleon resonances N∗ areusually parametrized by γ∗N → N∗ helicity amplitudes,at the resonance rest frame.Those amplitudes are, however, constrained by kinematic conditionsin the limit where the photon three-momentum vanishes(pseudothreshold limit).Although the pseudothreshold limit is below the photon point (Q2 = 0)it has an impact on the structure of the helicity amplitudesat low-Q2.Most of the empirical parametrizations of the data ignore those constraints.In our work we study the effect of the pseudothreshold constraintson some analytic parametrizations of the data,be performing analytic continuations ofthese parametrizations to the Q2 < 0 region.We conclude that the pseudothreshold constraints arefundamental for some resonances.

Primary author: Dr RAMALHO, Gilberto (Universidade Cruzeiro do Sul)

Presenter: Dr RAMALHO, Gilberto (Universidade Cruzeiro do Sul)



XV Hadron Physi … / Report of Contributions Effective approaches to hadronic s …


Effective approaches to hadronic systems

We review some results in quark matter and few nucleon systems using effective models for QCDand the nuclear force.

Primary author: SALVADOR TIMÓTEO, Varese (Universidade Estadual de Campinas)

Presenter: SALVADOR TIMÓTEO, Varese (Universidade Estadual de Campinas)



XV Hadron Physi … / Report of Contributions Mass spectra and Regge trajectorie …


Mass spectra and Regge trajectories of meson statesin a effective QCD model

This work is devoted to the discussion of the ground state and the orbitally and radially excitedstates of quark-antiquark mesons within the Tamm-Dancoff approximation of the Coulomb-gaugeQCD model. The Regge trajectories for angular and radial excitations are constructed, and theirproperties are analyzed. The calculated meson masses and their quantum numbers are used asbasis to attribute experimentally observed states to Regge trajectories.

Primary authors: COSTA, FRANCISCO MIGUEL (FRANCISCO MIGUEL); ABREU, Luciano (Fed-eral University of Bahia (Brazil)); Mrs FAVERO, Aline G.

Presenter: COSTA, FRANCISCO MIGUEL (FRANCISCO MIGUEL)



XV Hadron Physi … / Report of Contributions Neutrino oscillation with decay


Neutrino oscillation with decay

For many years, the Standard Model has described neutrinos as massless particles. In 2015, TakaakiKajita and Arthur B. McDonald received the Nobel Prize for the discovery of neutrino oscillations,which shows that they have mass. In this paper, we discuss the theory of this phenomenon, makinga brief historical introduction to the neutrino’s existence proposal and the solar neutrino problem,for which the oscillation model was proposed as a solution, and describing the standard oscillationin vacuum, in two and three flavors, and oscillation with invisible decay, also in two and threeflavors. The calculation of the first shows immediately that neutrinos must indeed have mass foroscillation to occur. We also obtain the transition probability from muonic to electronic neutrinosin matter, investigated by the NOνA experiment. We see that the effect of matter in this transitionis obtained by changing the mixing angle θ13 and the squared-mass difference ∆m2

31 to theireffective values in matter. We simulate the survival and transition probabilities, which lead toimportant discussions, such as the validity of the two-flavor model, order of magnitude of thedecay parameter and modification of the transition νµ → νe in matter.

Primary author: Mr MOREIRA, Thiago Henrique (Universidade Federal de Goiás)

Presenter: Mr MOREIRA, Thiago Henrique (Universidade Federal de Goiás)



XV Hadron Physi … / Report of Contributions Thermodynamically consistent qu …


Thermodynamically consistent quark matter modelwith density dependent mass

Abstract

Nearly half a century ago the existence of an absolute stable strange quark matter was conjectured[1] and it was based on a simple model known as the MIT bag model [2]. More recently, differentversions of density dependent quark models were proposed, but they lack thermodynamic consis-tency [3]. The main goal of the present work is to use a more sophisticated model called quasiparticle model [4], based on a density dependent mass that takes into account the confinementand leading-order perturbative interactions, and that is also thermodynamically consistent. Ourresults will be compared with the ones obtained from the MIT bag model. For this purpose, theequations of state of both models were derived and they will be soon implemented numerically.

References

[1] E. Witten, Phys. Rev. D 30,272 (1984).

[2] CHODOS, Ao et al. New extended model of hadrons. Physical Review D, v. 9, n. 12, p. 3471,1974.

[3] AGUDELO, David Felipe Tamayo. Matéria de Quarks à Temperatura Finita. 2013. Dissertação(Mestrado em Física) - Universidade Federal de Santa Catarina, Florianópolis, 2013.

[4] C. J. Xia, G. X. Peng, S. W. Chen, Z. Y. Lu, and J. F. Xu, Phys. Rev. D 89,105027 (2014).

Primary author: MARZOLA, Isabella

Co-authors: Mrs BACKES, Betânia (Federal university of Santa Catarina); PERES MENEZES, Debora(Federal University of Santa Catarina (UFSC))

Presenter: MARZOLA, Isabella



XV Hadron Physi … / Report of Contributions Effective models and phase transit …


Effective models and phase transitions in QCD

In the present work the phase diagram of QCD is obtained by means of two effective models. Forthe description of the quarks matter we make use of the MIT bag model, and for the descriptionof the hadronic matter we make use of the non-linear Walecka model (NLWM).The Gibbs conditions are used to establish the crossing points of the pressures in function of thechemical potentials obtained in both phases.Some restrictions are imposed when choosing models. The MIT model is used only with constantvalues satisfying the Bodmer-Witten conjuncture. The NLWM, in turn, is restricted to parameter-izations that satisfy several nuclear and astrophysical properties.Two situations are considered for the description of the hadronic matter; in the first one the condi-tions of matter of compact stars are imposed and the model is extrapolated to finite temperatures,and in the second situation we consider symmetrical matter.

Primary authors: Ms BIESDOF, Carline (Universidade Federal de Santa Catarina (UFSC)); Prof.PERES MENEZES, Debora (Universidade Federal de Santa Catarina (UFSC))

Presenter: Ms BIESDOF, Carline (Universidade Federal de Santa Catarina (UFSC))



XV Hadron Physi … / Report of Contributions Quark-antiquark potentials in non …


Quark-antiquark potentials in nonperturbativemodels

Many models have tried to explain some non-perturbative aspects of the strong interactions, inparticular, the color confinement hypothesis of quantum chromodynamics (QCD), but actually,they do not fully explain it. In this work, we investigate some of these non-perturbative modelsfor QCD with the purpose of testing its validity in the perturbative region of nuclear interactionswhere the perturbative predictions with quasi-free quarks are in agreement with the experimentaldata, as well as to explore its behavior in the infrared region. In particular, we focused on the calcu-lations and analysis of the potentials between heavy quarks and antiquarks, since this observablemight reveal the appearance of confinement properties in non-perturbative models through a lin-ear growth at large and intermediate distances. We calculated the potentials associated with theMassive Gluon (Yukawa), Gribov-Zwanziger and Gribov-Zwanziger Refined models at tree levelfor the non-relativistic case. In addition, we have included the flux of the Renormalization Groupin the QCD coupling constant, which allowed us to study the energy-scale dependence of the pa-rameters of the potentials treated here. Our results indicate that, in the tree-level approximation,all potentials we have obtained can reproduce the perturbative result at high energies and someof them bring significant non-perturbative corrections. We also present one-loop corrections anddiscuss the two-loop modifications in the case of the Curci-Ferrari model.

Primary author: MENA , Carlos (UERJ)

Co-author: Prof. PALHARES, Letícia (UERJ)

Presenter: MENA , Carlos (UERJ)



XV Hadron Physi … / Report of Contributions Thermodynamically consistent qu …


Thermodynamically consistent quark matter modelwith density dependent mass

Abstract

Nearly half a century ago, the existence of an absolute stable strange quark matter (SQM) was con-jectured [1] and it was based on a simple model known as the MIT bag model [2]. More recently,different versions of density dependent quark models were proposed, but they lack thermody-namic consistency [3]. The main goal of the present work is to use a more sophisticated model[4], based on a density dependent mass that takes into account the confinement and leading-orderperturbative interactions, and that is also thermodynamically consistent. The equations of statewere derived and implemented numerically. Our results show explicitly the thermodynamic con-sistency of the model, along with it’s stability window at zero temperature.

References

[1] E. Witten, Phys. Rev. D 30, 272 (1984).

[2] A. Chodos, R. L.Jaffe, K. Johnson, C. B. Thorn and V. F. Weisskopf, Phys. Rev. D 9,3471 (1974).

[3] AGUDELO, David Felipe Tamayo. Matéria de Quarkas à Temperatura Finita. 2013. Dissertação(Mestrado em Física) - Universidade Federal de Santa Catarina, Florianópolis, 2013.

[4] C. J. Xia, G. X. Peng, S. W. Chen, Z. Y. Lu, and J. F. Xu, Phys. Rev. D 89,105027 (2014).

Primary author: BACKES, Betânia

Co-authors: HAFEMANN, Eduardo (UFSC); MARZOLA, Isabella; PERES MENEZES, Debora (Fed-eral University of Santa Catarina (UFSC))

Presenter: BACKES, Betânia



XV Hadron Physi … / Report of Contributions An analysis on the exclusive produ …


An analysis on the exclusive production of lightmesons at the LHC

The central diffractive production of mesons f0 (980) and f2(1270) at the energy of CERN-LargeHadron Collider experiment on proton-proton collisions is investigated. The processes initiatedby quasireal photon-photon collisions and by central diffraction processes are considered. Therole played by the photon-Odderon production channel is also studied. The cross sections forthese distinct production channels are compared and analyzed.

Primary author: MACHADO, Magno (IF-UFRGS)

Presenter: MACHADO, Magno (IF-UFRGS)



XV Hadron Physi … / Report of Contributions Measuring the speed of sound of t …


Measuring the speed of sound of the quark-gluonplasma in ultracentral nucleus-nucleus collisions

We show that, within the hydrodynamic framework of heavy-ion collisions, the mean transversemomentum of charged hadrons (⟨pt⟩) rises as a function of the multiplicity in ultra-central nucleus-nucleus collisions. The relative increase is proportional to the speed of sound squared (c2s) of thequark-gluon plasma, that is therefore accessible experimentally using ultra-central data. Based onthe value of c2s calculated in lattice QCD, we predict that ⟨pt⟩ increases by ≈ 18 MeV between 1%and 0.001% centrality in Pb+Pb collisions at √sNN = 5.02 TeV.

Primary authors: GARDIM, Fernando G (Federal University of Alfenas - BRA); Dr OLLITRAULT,Jean-Yves (Saclay); Ms GIACALONE, Giuliano (SACLAY)

Presenter: GARDIM, Fernando G (Federal University of Alfenas - BRA)



XV Hadron Physi … / Report of Contributions Anisotropic Compact Stars in …


Anisotropic Compact Stars in Rastall-RainbowGravity

We have investigated anisotropic neutron stars in the framework of Rastall-Rainbow gravity. Ourcalculations were computed using the IU-FSU realistic equation of state (EoS), in which was con-sidered two cases: standard nucleonic composition and the one with the eight lightest baryons.From the neutron star masses and radii obtained we conclude that when Rastall-Rainbow gravityand anisotropy are simultaneously considered, they provide the best results for mass and radiusvalues, including important astrophysical objects such as the LMXB NGC 6397 and the extremelymassive pulsar millisecond MSP J0740 + 6620. Although the expected inclusion of hyperons inthe nuclear model reproduces stellar masses smaller than those produced by standard nucleonicmatter, we shown that the hyperon puzzle problem can be circumvented by including anisotropiceffects on compact stars in the context of the Rastall-Rainbow gravity.

Primary authors: Mr EVANGELISTA MOTA, Clésio (Universidade Federal de Santa Catarina -UFSC); CÉSAR NUNES DOS SANTOS, Luis (UFPB); MANOEL DA SILVA, Franciele (UFSC); OSWALDOVASQUEZ FLORES, Cesar (UFSC); JOSÉ NUNES DA SILVA, Tiago (UFSC); PERES MENEZES, Débora(UFSC)

Presenter: Mr EVANGELISTA MOTA, Clésio (Universidade Federal de Santa Catarina - UFSC)



XV Hadron Physi … / Report of Contributions Statistical fluctuations in the pasta …


Statistical fluctuations in the pasta phase

Exotic shapes of nuclei exist which are known as pasta phase. These are possible to occur at highdensities, such as the crust of neutron stars, and are due to the competition between the strongand electromagnetic forces, resulting in a frustrated system. Calculations of such shapes usuallyassume a crystalline structure described by repetitions of the same Wigner-Seitz cells for fixedtemperature, density and proton fraction. Such approximation is unrealistic since the differencein free energy for each pasta configuration is very small, allowing for different configurations toexist in equilibrium.

In this work we utilize mean field theory with the Non-linear Walecka Model to calculate theprobability distribution for the pasta configurations using the free energy of a single Wigner-Seitzcell and the approximation of phase-coexistence.

Primary author: Mr PELICER, Mateus (Universidade Federal de Santa Catarina)

Presenter: Mr PELICER, Mateus (Universidade Federal de Santa Catarina)



XV Hadron Physi … / Report of Contributions Neutron stars: The journey from b …


Neutron stars: The journey from birth to death.

Neutron star observations, including those from Chandra, LIGO and anticipated results from theNICER mission, continue to provide unique insight into the role that neutron stars play in stellarevolution and the nature of the dense matter in the neutron star core. After being created in a core-collapse supernova explosion, the neutron star’s first minute (as a “proto-neutron star) is critical.It is during this brief time that the neutron star’s final mass, composition, and fate are decided.Depending upon its distance from earth, the supernovae explosion can, in favourable cases, beobserved in photons, neutrinos, and gravitational waves: the manifest promise of multi-messengerastronomy.

One of the critical uncertainties in neutron star structure and discussion of the maximum pos-sible neutron star mass is the composition of matter in the core. However, most simulations ofcore-collapse supernovae and neutron star mergers do not take into account this compositionaluncertainty. Many assume that the core is composed only of neutrons, protons and electrons.This omission is particularly problematic for the evolution of the proto-neutron star, when exoticdegrees of freedom, such as de-confined quarks, are most likely to appear.

In this talk I will discuss properties of high density matter in the cores of cold and hot (proto)neutronstars as predicted by the Quark-Meson-Coupling (QMC) Model [1]. This model, which self-consistentlyrelates the dynamics of the internal quark structure of a hadron to the relativistic mean fields aris-ing in nuclear matter, provides a natural answer to many open questions in low energy nuclearphysics. These include the origin of many-body nuclear forces and their saturation, the spin–orbitinteraction and properties of hadronic matter at a wide range of densities up to those occurringin the cores of neutron stars. The QMC energy density functional depends on a single set offour adjustable parameters which are narrowly constrained. The same QMC formalism, withoutintroducing additional parameters, can be applied to any particles composed of quarks, such ashyperons. The forces between hyperons and between hyperons and nucleons are calculated inmean field approximation within the model without the need for an external calibration.

I will report results on the Equation of State, masses, radii, baryon and lepton content and itsdistribution inside the star. In addition, rotation, tidal deformation and the I-Love-Q relation atfinite temperature will be discussed. A comparison with other selected models will be made.

Primary author: Prof. STONE, Jirina (Department of Physics and Astronomy, University of Ten-nessee, Knoxville, US)

Presenter: Prof. STONE, Jirina (Department of Physics and Astronomy, University of Tennessee,Knoxville, US)



XV Hadron Physi … / Report of Contributions Non-Perturbative Information fro …


Non-Perturbative Information from QCD GreenFunctions

We review the computation of the two-point (propagators) and the quark-gluon vertex using non-perturbative first principle methods. Topics concerned with quark and gluon confinement togetherwith chiral symmetry breaking and there relation with the propagators and vertex are also ad-dressed.

Primary author: OLIVEIRA, Orlando (University of Coimbra)

Presenter: OLIVEIRA, Orlando (University of Coimbra)



XV Hadron Physi … / Report of Contributions Parton distribution functions from …


Parton distribution functions from lattice QCD

Parton Distribution Functions (PDFs) are the fundamental objects containing information on theflavour structure of hadrons, and on how the hadron spin and momentum are distributed amongits constituents, quarks and gluons. Because they are non-perturbation quantities, we must relyon non-perturbative methods for their computation. Lattice QCD (LQCD) is the most successfulmethod to access the non-perturbative physics. Even so, in the case of PDFs LQCD is, essentially,not useful because PDFs are given by light-cone correlations, while LQCD is applicable to real-timecorrelations. However, several years ago Ji proposed a new method to compute PDFs in LQCDbased on Large Momentum Effective Theory. Within this method, one computes purely spatialcorrelations, accessible to LQCD, which can be related, upon a suitable perturbative calculation,to the light-cone correlations. The Fourier transform of the purely spatial matrix elements arecalled quasi-PDFs. In this talk, we will give an overview of the quasi-PDF approach, showinghow to obtain light-cone PDFs from quasi-PDFs. We will present the state-of-art of the latticecomputations of PDFs as well as discussing future directions to this field.

Primary author: STEFFENS, Fernanda (University of Bonn)

Presenter: STEFFENS, Fernanda (University of Bonn)



XV Hadron Physi … / Report of Contributions Few-body physics in Minkowski s …


Few-body physics in Minkowski space

In recent years, it is becoming more and more attractive the possibility of exploring the dynamicsinside few-body systems directly in Minkowski space. A fully quantum-field treatment of thedynamics together with the adoption of the physical space open a new path for investigating therelativistic effects on the momentum distribution as well as the approach to critical regimes.

Primary author: SALME’, Giovanni (Istituto Nazionale di Fisica Nucleare)

Presenter: SALME’, Giovanni (Istituto Nazionale di Fisica Nucleare)



XV Hadron Physi … / Report of Contributions Photon induced processes from …


Photon induced processes from semi-central toultraperipheral heavy-ion collisions

Ultrarelativistic heavy ions are accompanied by a large flux of quasi-real Weizsäcker-Williamsphotons. This opens a broad range of research possibilities, as the Weizsäcker-Williams photonscan be used to study photon-photon fusion reactions as well as photonuclear reactions in a widerange of energies, see for example the review [1].

Of special interest here are diffractive photoproduction reactions, which appear in two majorclasses: the coherent diffraction in which the target nucleus stays intact and the incoherent (orquasielastic) diffraction in which the nucleus breaks up, but no additional particles are producedin the nuclearfragmentation region.

We will discuss the coherent and incoherent diffractive photoproduction of heavy vector mesonsJ/ψ and Υ based on our recent papers [2, 3]. Good agreement with available experimental data bythe ALICE and LHCb collaborations can be obtained within a color-dipole approach. Diffractivephotoproduction of heavy-flavour vector mesons has long been discussed as a probe of the target’sgluon distribution, and we will discuss implications for the nuclear glue.

Very recently, the role of Weizsäcker-Williams photons in peripheral, inelastic, heavy ion collisionshas come under scrutiny. Recent measurements of dilepton production of the STAR collaborationin √sNN =200 GeV Au-Au collisions indicate an excess at small pair pT most notably in peripheralcollisions. We show, that it can be that has attributed to the initial photon fusion which is mostsignificant at small pair transverse momenta [4].

[1] C. A. Bertulani, S. R. Klein and J. Nystrand, “Physics of ultra-peripheral nuclear collisions,” Ann.Rev. Nucl. Part. Sci. 55 (2005) 271 [nucl-ex/0502005].[2] A. Luszczak and W. Schäfer, “Incoherent diffractive photoproduction of J/ψ and Υ on heavynuclei in the color dipole approach,” Phys. Rev. C 97 (2018) no.2, 024903 [arXiv:1712.04502 [hep-ph]].[3] A. Luszczak and W. Schäfer, “Coherent photoproduction of J/ψ in nucleus-nucleus collisions inthe color dipole approach,” Phys. Rev. C 99 (2019) no.4, 044905 [arXiv:1901.07989 [hep-ph]].[4] M. Klusek-Gawenda, R. Rapp, W. Schäfer and A. Szczurek, “Dilepton Radiation in Heavy-IonCollisions at Small Transverse Momentum,” Phys. Lett. B 790 (2019) 339 [arXiv:1809.07049 [nucl-th]].

Primary author: SCHAEFER, Wolfgang (Institute of Nuclear Physics PAN, Krakow)

Presenter: SCHAEFER, Wolfgang (Institute of Nuclear Physics PAN, Krakow)



XV Hadron Physi … / Report of Contributions FSI in 3-body decay: challenges an …


FSI in 3-body decay: challenges and future

Three-body decays of heavy-flavoured hadrons into light particles are sequential processes, dom-inated by intermediate resonant states that requires a full amplitude analysis to be determined.These decays are a natural source of information about two-body scattering amplitudes, as an al-ternative to the early scattering data. However, the determination of the two-body amplitudesrequires the understanding of the role of final-state interactions (FSI) and strong phases from theprimary weak vertex. This is also a crucial step to understand the massive localized CP violationobserved in B+ → h−1 h

+2 h

+3 (hi ≡ π,K) decays from LHCb.

The gigantic samples of B and D decays collected by the LHCb, BES-III and, in the near future,Belle II experiments motivated theoretical efforts in the past decade towards building models thatare based on more solid grounds. These models improve essentially the description of FSI by us-ing coupled-channels formalism and imposing two-body unitarity, in the framework of dispersionrelations and chiral perturbation theory. Most models are based on the quasi-two-body (2+1) ap-proximation, in which interactions with the third particle are neglected. Three-body FSI, however,may play significant role, especially in D decays as for the D+ → K−π+ + π+ decay.

In this talk an overview of these models will be presented. In particular, two important results willbe discussed, namely D+ → K−K+K+ and B+ → K−K+K+. In the first case, the focus is onthe determination of theK−K+ scattering amplitudes, whilst in the second decay, the focus is onthe underlying mechanisms of the CP asymmetries pattern observed in the Dalitz plot.

Primary author: MAGALHAES, Patricia (University of Bristol)

Presenter: MAGALHAES, Patricia (University of Bristol)



XV Hadron Physi … / Report of Contributions Relativistic Landau levels via …


Relativistic Landau levels via Feynman-Gell-Mannformulation

The planar motion of spin-1/2 fermions under the influence of a homogeneous magnetic field isdescribed by the Feynman-Gell-Mann formulation of the Dirac equation. The axially symmetricgauge is used for the vector potential in such a way that the Dirac spinor is written in termsof eigenstates of the quiral operator and the third component of the total angular momentumoperator. The spinors are split in eigenstates of the third component of the spin operator andthe corresponding radial functions obey uncoupled second-order equations similar to the singularharmonic oscillator in the nonrelativistic theory.

Primary author: Mr MENDROT, Vitor (UNESP)

Presenter: Mr MENDROT, Vitor (UNESP)



XV Hadron Physi … / Report of Contributions Diffractive gauge boson productio …


Diffractive gauge boson production at the LHC as aprobe of the flavor content of the Pomeron

The production of the W and Z bosons in single diffractive processes at the LHC is investigatedtaking into account the ATLAS, CMS and LHCb acceptances and considering different assumptionsfor the flavour content of the Pomeron. The total cross sections and pseudorapidity distributionsare estimated for pp collisions at √s=13 TeV. Our results indicate that a future experimental analysisof the ratio between the W and Z cross sections can be used to probe the flavour content of thePomeron.

Primary author: ERNANI MARTINS NETO, Daniel (UFRJ)

Co-authors: GONCALVES, Victor (Universidade Federal de Pelotas); RANGEL, Murilo (LAL)

Presenter: ERNANI MARTINS NETO, Daniel (UFRJ)



XV Hadron Physi … / Report of Contributions Rescattering in exclusive photopro …


Rescattering in exclusive photoproduction ofquarkonia in UPCs

In the exclusive production of vector mesons in nuclear collisions(\gamma A), we have to take into account two main nuclear effects inorder to make a precise calculation of the scattering amplitude: thegluon shadowing and the finite coherence length. The first deals withthe main source of rescattering in the production of heavy quarkpairs, making the gluon density in a nuclei to be suppressed comparedto a free nucleon due to interference among the multiuple scatterings.The second is the dependence on the finite lifetime of the photonfluctuation into q-qbar pair inside the nucleus and is particularlyimportant in low energy regimes. This banner aims to study thetheoretical tools (and possible improvements to them) used to predictthe exclusive vector meson production (i.e. J/Psi or Upsilon) in highenergy nuclear collisions.

Primary authors: MELCHIORS TREBIEN, Haimon Otto (UFSC); DE OLIVEIRA, Emmanuel (UFSC)

Presenter: MELCHIORS TREBIEN, Haimon Otto (UFSC)



XV Hadron Physi … / Report of Contributions Exclusive vector meson productio …


Exclusive vector meson production in UPC

A good way to describe the production of vector mesons is by the color dipole model. In thisapproach, the interaction of the photon with the target is described by a phenomenologically pa-rameterized dipole cross section. The photon and meson wave functions, which can be obtainedby solving the Schröedinger equation for different potentials, with the inclusion of Melosh spin ro-tation, can not only describe the quarkonia ground states but also the excited states. In this work,these ingredients are used to calculate the γp cross section for the production of bottommoniaand charmonia and compared with some newly available data. Then this formalism is extended toultraperipheral AA collisions, where some interesting effects need to be included, such as gluonshadowing and finite coherent length.

Primary authors: HENKELS DE SOUZA, Cheryl (UFSC); DE OLIVEIRA, Emmanuel (UFSC)

Presenter: HENKELS DE SOUZA, Cheryl (UFSC)



XV Hadron Physi … / Report of Contributions The Quantum Chromodynamics P …


TheQuantum Chromodynamics Phase Diagramwithin Effective Models Frameworks

Different extensions of the Nambu-Jona-Lasinio model, known to satisfy expected QCD chiralsymmetry aspects, are presented and used to investigate a possible hadron-quark phase transitionat zero temperature. In special, one version of these NJL-type models, suitable to describe bothnucleonic and hyperonic matter, is partially developed in this work. In an early exploratory study,it is shown that the transition point is very sensitive to the model parameters and that both pressureand chemical potential increase drastically with the increase of the vector interaction strength inthe quark sector.

Primary author: MARQUEZ, Kauan (Federal University of Santa Catarina, Brazil)

Co-author: PERES MENEZES, Debora (Federal University of Santa Catarina (UFSC))

Presenter: MARQUEZ, Kauan (Federal University of Santa Catarina, Brazil)



XV Hadron Physi … / Report of Contributions Orbital Properties and Gravitation …


Orbital Properties and Gravitational WavesSignatures of Strange Crystal Planets

In this work we consider the possibility that strange quark matter may be manifested in the form ofstrange crystal planets. These planet-like objects are made up of nuggets of strange quark matter(SQM), organized in a crystalline structure. We consider the so–called strange matter hypothesisproposed by Bodmer, Witten and Terazawa, in that, strange quark matter may be the absolutelystable state of matter. {\bf In this context, we analyze planets made up} entirely of strangeletsarranged in a crystal lattice. Furthermore we propose that a solar system with a host compactstar may be orbited by strange crystal planets. Under this assumption we calculate the relevantquantities that could potentially be observable, such as the planetary tidal disruption radius, andthe gravitational waves signals that may arise from potential star-planet merger events. Our resultsshow that strange crystal planets could potentially be used as an indicator for the the existence ofSQM.

Primary authors: NEGREIROS, Rodrigo (Universidade Federal Fluminense); Ms ZAPATA, Joás(Universidade Federal Fluminense)

Presenter: NEGREIROS, Rodrigo (Universidade Federal Fluminense)



XV Hadron Physi … / Report of Contributions Dynamical vs. Explicit Dynamical …


Dynamical vs. Explicit Dynamical Chiral SymmetryBreaking

The relative contributions of explicit and dynamical chiral symmetry breaking in QCD models ofthe quark-gap equation are studied in dependence of frequently employed Ansätze for the dressedinteraction and quark-gluon vertex. In a naive quark picture, explicit symmetry breaking contribu-tions are defined by a constituent-quark sigma term whereas the combined effects of explicit anddynamical symmetry breaking are described by a Euclidean constituent-mass solution. We extendthis study of the gap equation to a quark-gluon vertex derived from longitudinal and transverseSlavnov-Taylor identities and complemented with numerical gluon- and ghost-dressing functionsfrom lattice QCD. In comparison, we discuss the dynamical chiral symmetry breaking contribu-tions to the mass of light baryons in the limit of vanishing quark masses.

Primary author: Prof. EL-BENNICH, Bruno (Cruzeiro do Sul University)

Presenter: Prof. EL-BENNICH, Bruno (Cruzeiro do Sul University)



XV Hadron Physi … / Report of Contributions Dynamic gluon mass generation fr …


Dynamic gluon mass generation from the effectivepotential of the Gribov-Zwanziger theory

The Gribov-Zwanziger theory takes into account the effect of Gribov gauge copies and may providean effective description of the infrared regime of QCD. The success of this approach is based on thecompatibility of its predictions with the available lattice data for correlation functions, especiallygluon and ghost propagators, which point towards a dynamic mass generation in the form ofdimension-2 condensates of the gluon and auxiliary fields. In this talk, we address the task ofcomputing explicitly these condensates within the Gribov-Zwanziger framework by minimizingthe corresponding one-loop effective potential in a fully BRST-invariant setting.

Primary author: Prof. PALHARES, Letícia (UERJ)

Presenter: Prof. PALHARES, Letícia (UERJ)



XV Hadron Physi … / Report of Contributions Continuum Limit of Gluon and Gh …


Continuum Limit of Gluon and Ghost Propagators inMinimal Landau Gauge

We study the continuum limit of SU(2) Landau-gauge gluon and ghost propagators, obtained fromnumerical simulations performed on lattice volumes of up to 192⁴, in the scaling region.

Primary author: MENDES, Tereza

Presenter: MENDES, Tereza



XV Hadron Physi … / Report of Contributions Limiting Fragmentation in Hadron …


Limiting Fragmentation in Hadronic and Nuclearcollisions

We discuss limiting fragmentation within a few currently popular phenomenological models. Weshow that popular Glauber-inspired models of particle production in heavy ion collisions gener-ally fail to reproduce limiting fragmentation when all energies and system sizes experimentallyavailable are considered, due to the energy-dependence of number of participants and number ofcollisions. We quantify this violation in terms of the model parameters. We also make the samecalculation within a Color Glass Condensate scenario and show that the dependence of the satu-ration scale on the number of participants generally leads to violation of limiting fragmentation.We further argue that wounded parton models, provided the nucleon size and parton density varypredominantly with Bjorken x, could in principle reproduce both multiplicity dependence withenergy and limiting fragmentation. We suggest, therefore, that an experimental measurement ofdeviation from limiting fragmentation in heavy ion collisions, for different system sizes and in-cluding the experimentally available range of energies, is a powerful test of initial state models.

Primary author: TORRIERI, Donato Giorgio (Unicamp)

Presenter: TORRIERI, Donato Giorgio (Unicamp)



XV Hadron Physi … / Report of Contributions Spontaneous generation of a gluon …


Spontaneous generation of a gluon mass fromsymmetry restoration in Yang-Mills theory

In this work we study the quantization of Yang-Mills theories by taking into account the effects ofGribov copies in the Serreau-Tissier approach, therefore we finally establish a good explanationfor the generation of the gauge field (gluon) mass added in the particular Curci-Ferrari by using thesymmetry restoration phenomenon. To accomplish that, we also discuss the similarities betweenthe nonlinear sigma models in two space-time dimensions and Quantum Chromodynamics.

Primary authors: Dr SERREAU, Julien (Université Paris Diderot); Dr TISSIER, Matthieu (SorbonneUniversité); Mr TERIN, Rodrigo (UERJ e Sorbonne Université); Dr REINOSA, Urko (École Polytech-nique)

Presenter: Mr TERIN, Rodrigo (UERJ e Sorbonne Université)



XV Hadron Physi … / Report of Contributions Limiting fragmentation as an …


Limiting fragmentation as an initial-state probe inheavy ion collisions

We discuss limiting fragmentation within a few currently popular phenomenological models. Weshow that popular Glauber-inspired models of particle production in heavy ion collisions, such asthe two-component model, generally fail to reproduce limiting fragmentation when all energiesand system sizes experimentally available are considered. This is due to the energy dependence ofnumber of participants and number of collisions. We quantify this violation in terms of the modelparameters. We also make the same calculation within a color glass condensate scenario andshow that the dependence of the saturation scale on the number of participants generally leads toviolation of limiting fragmentation. We further argue that wounded parton models, provided thenucleon size and parton density vary predominantly with Bjorken x, could in principle reproduceboth multiplicity dependence with energy and limiting fragmentation. We suggest, therefore, thatan experimental measurement of deviation from limiting fragmentation in heavy ion collisions, fordifferent system sizes and including the experimentally available range of energies, is a powerfultest of initial-state models.

Primary authors: GONÇALVES, Kayman (Unicamp); Dr V. GIANNINI, Andre (Akita InternationalUniversity); Dr CHINELLATO, David D. (Unicamp); Dr TORRIERI, Donato Giorgio (Unicamp)

Presenter: GONÇALVES, Kayman (Unicamp)



XV Hadron Physi … / Report of Contributions Alpha_s determinations from e+e- …


Alpha_s determinations from e+e- to hadrons withn_f=3, 4 and 5

We will describe two different strategies for the extractionof the strong coupling, alpha_s, using data for e+e- to hadrons. Inthe first one, we determine the strong coupling using finite-energysum rules and a new compilation of the hadronic R-ratio from availabledata for e+e- —> hadrons below the charm threshold. Thisdetermination is done at relatively low-energies, with three activeflavours (n_f=3) and is complementary to extractions from hadronic taudecays. We will also present a new strategy for the determination ofthe coupling from ratios of moments of the charm- and bottom-quarkvector correlators, with n_f=4 and n_f=5, respectively. The use of lattice data for the PS correlatorwill also be described. We will show that these recent determinations of the strong coupling arecompetitive and reliable.

Primary author: BOITO, Diogo (Universidade de São Paulo)

Presenter: BOITO, Diogo (Universidade de São Paulo)



XV Hadron Physi … / Report of Contributions CP violation in B->hhh (h=k,pi) de …


CP violation in B->hhh (h=k,pi) decays

We will present recently published results on direct CP violation on charmless B decays in threehadrons form LHCb collaboration. B+->pi+pi-pi+ and B+->K+K-pi+ amplitude analysis were ac-complished shedding new light on the role of the strong hadronic interaction in the CPV dynamics.

Primary author: MIRANDA, Jussara (cbpf)

Presenter: MIRANDA, Jussara (cbpf)



XV Hadron Physi … / Report of Contributions Diffractive excitation in proton- …


Diffractive excitation in proton-proton andproton-nucleus scattering at high energies

We present an update of the Miettinen-Pumplim (MP) model for diffractive excitation for proton-proton (pp) and antiproton-proton (p̄p) scattering considering recent LHC data. The energy de-pendence of cross sections is analyzed and compared to the available data. The implications of thediffractive excitation in proton-nucleus (pA) collisions are also discussed for different nuclei. Weused the MP model to derive the main quantities present in the treatment of the diffractive excita-tion in pA collisions. We show that the effect of fluctuations, responsible for diffractive excitation,decreases for heavier nuclei and higher energies.

Primary authors: Dr SILVA, Paulo V.R.G. (Universidade Federal de Pelotas); Prof. GONÇALVES,Victor P. (Universidade Federal de Pelotas); Ms PALOTA DA SILVA, Rafael (Universidade Federal dePelotas)

Presenter: Dr SILVA, Paulo V.R.G. (Universidade Federal de Pelotas)



XV Hadron Physi … / Report of Contributions Chiral symmetry breaking in …


Chiral symmetry breaking in massive-gluon QCD

Lattice simulations show that the running coupling constants obtained through QCD vertices dif-fer in the infrared even though their bare values are the same. For instance, at low momenta thestrength of the quark-gluon coupling is about twice the ghost-gluon coupling. None of them di-verge in the infrared as it is predicted by standard perturbation theory. Moreover, the ghost-gluoncoupling remains moderate even in the infrared. This observation motivates the use of perturba-tion theory in the ghost-gluon sector in the frame of a massive deformation of QCD Lagrangian inLandau gauge. However, perturbation theory in the quark sector within this massive Lagrangiandoesn´t bring as good results as in the pure Yang-Mills case, as should be expected from the largervalue of the quark-gluon coupling constant.We propose a controlled systematic expansion in full QCD based in two small parameters: first theYang.Mills sector couplings and second the inverse of the number of colors (large-Nc limit). Thissystematic expansion allows us to properly introduced the use of the renormalization group forthe rainbow resummation.At leading order, this double expansion leads to the well-known rainbow approximation for thequark propagator whose solution shows spontaneous chiral symmetry breaking for sufficientlylarge quark-gluon coupling constant.

Primary author: Dr PELÁEZ, Marcela (UdelaR)

Presenter: Dr PELÁEZ, Marcela (UdelaR)



XV Hadron Physi … / Report of Contributions Photoproduction of jets at forward …


Photoproduction of jets at forward rapidities inultraperipheral collisions.

The particle production at very forward rapidities is expected to be sensitive to the non-lineareffects in the QCD dynamics at high energies. In this paper we present, for the first time, thepredictions of the Color Dipole formalism for the single inclusive jet photoproduction in pp andpPb collisions considering the very forward rapidities probed by the CMS – CASTOR calorimeter,which will be characterized by a jet in the rapidity range of 5.2 ≤ Y ≤ 6.6, a rapidity gap in therapidity range probed by the central CMS detector and one of the incident hadrons remaining intactin the final state. The transverse momentum distributions are estimated considering the morerecent phenomenological models for the dipole - proton scattering amplitude, which are basedon the Color Glass Condensate formalism and are able to describe the inclusive and exclusive epHERA data. Our results indicate that a future experimental analysis of this process is, in principle,feasible and useful to contrain the description of the QCD dynamics at high energies.

Primary authors: RODRIGUES SENA, Celso; GONCALVES, Victor (Universidade Federal dePelotas); Dr SAMPAIO DOS SANTOS, Gláuber

Presenter: RODRIGUES SENA, Celso



XV Hadron Physi … / Report of Contributions Experimental opportunities in had …


Experimental opportunities in hadron physics

Quantum Chromodynamics is the accepted theory of the strong interaction. The gauge bosonstransmitting the force are gluons. However, the non-perturbative part of QCD is far from beingunderstood on a fundamental level. Non-perturbative aspects of QCD can be especially well stud-ied when the gauge fields play a prominent role. A typical example are glueballs, massive particlescomposed solely of a priori massless gluons, which are an excellent case to proof our understand-ing of non-perturbative QCD. The only problem that remains is the unambiguous identificationglueballs and interpretation of glueballs. Other unusual quark-gluon configurations predicted aswell by QCD hhave been clearly identified in recent years by experiments and will pave the pathfor a deeper understanding of the underlying theory. The talk reviews the current status and futureperspectives on experimental studies of non-perturbative QCD.

Primary author: Prof. WIEDNER, Ulrich (Ruhr University Bochum)

Presenter: Prof. WIEDNER, Ulrich (Ruhr University Bochum)



XV Hadron Physi … / Report of Contributions Two-photon opportunities at …


Two-photon opportunities at electron-positroncolliders

Decades ago, particles that consist solely of gluons, so-called glueballs, have been predicted fromtheory. According to present knowledge, lattice-QCD calculations predict several glueball candi-dates in the mass range of 1.5 - 4 GeV/c^2 (depending on their quantum numbers). Studying thenature of light mesons in two-photon decays, offers indirect information on their gluonic contentand acts as a anti “glueball filter” at lowest order. However, it turns out that experimental identifi-cation of glueballs is often ambiguous due to the mixing of glueballs with ordinary mesons carryingthe same quantum numbers and interference in the highly populated regime of light mesons.The poster will review results carried out in two-photon production in the past and point out op-portunities and future perspectives of recent experiments (e.g. BESIII and Belle II). So far, manysingle channel analyses have been performed by previous experiments like L3 and Belle. There-fore, advantages of modern amplitude analysis techniques and coupled channel analyses will bepointed out. Finally, recent results on two-photon production at BESIII as part of my PhD project,will be discussed as well.

Primary author: Ms KÜßNER, Meike (Ruhr-University Bochum)

Presenter: Ms KÜßNER, Meike (Ruhr-University Bochum)



XV Hadron Physi … / Report of Contributions Nuclear Femtography Studies with …


Nuclear Femtography Studies with the CLAS12 atJefferson Lab and the Future Electron Ion Collider

Major progress in theoretical formalism of the interior structure of the Nucleon over the last 30years has led to breakthroughs in our understanding of the theory of the fundamental substructureof the protons and neutrons. At the same time, the technical advances in particle accelerator andstate of the art experimental detection technologies along with dramatic developments in com-puting power and algorithms, have brought us to the threshold of a new science. Large amountsof data (~PB per week) will need to be analyzed to provide the experimental input to the 3D pro-ton/neutron imaging. The characterization and visualization of these distributions is an additionalchallenge. We will present the status and the plans for the current and future experiments withCLAS12 at Jefferson Lab and the Electron Ion Collider and discuss the required interdisciplinaryeffort between physics theory and experiment, computing in data science, imaging/visualizationand mathematics to start addressing some of the fundamental questions at the sub-femtometerscale critical to the understanding of our universe.

Primary author: Prof. ELOUADRHIRI, Latifa (Thomas Jefferson National Accelerator Facility)

Presenter: Prof. ELOUADRHIRI, Latifa (Thomas Jefferson National Accelerator Facility)



XV Hadron Physi … / Report of Contributions Nucleon-nucleon correlations in n …


Nucleon-nucleon correlations in nuclear matter

Nucleon-nucleon correlations play an important role in the structure and binding energy of nu-clei and nuclear matter. The attractive intermediate-range interaction tends to bind nucleons inpairs while the repulsive core of the interaction creates short-range correlations that keep the nu-cleons apart. Here, the standard 1S0 and the quasideuteron 3S1 −3 D1 pairing fields are studiedin nuclear matter, using a Bonn meson-exchange interaction in a Dirac-Hartree-Fock-Bogoliubovapproximation. A quasideuteron field is found in both symmetric and asymmetric nuclear matter.The quasideuteron pairing field in asymmetric nuclear matter is stable only when accompaniedby standard 1S0 neutron-neutron and proton-proton pairing fields. The correlation radius of anucleon-nucleon pair and their short-range correlations can be characterized in terms of the mo-mentum distributions of the pairing fields. We analyze these quantities, as well as the pairingfields, as functions of the density and the asymmetry.

Primary author: CARLSON, Brett (Instituto Tecnológico de Aeronáutica)

Presenter: CARLSON, Brett (Instituto Tecnológico de Aeronáutica)



XV Hadron Physi … / Report of Contributions Studies of the 3D Structure of the …


Studies of the 3D Structure of the Nucleon

The quark-gluon dynamics manifests itself in a set of non-perturbative functions describing allpossible spin-spin and spin-orbit correlations. The Transverse Momentum Dependent parton dis-tributions (TMDs) and Generalized Parton Distributions (GPDs) carry information not only onthe longitudinal but also on the transverse momentum and position of partons, providing rich anddirect information on the orbital motion of quarks. Single and Dihadron semi-inclusive and hardexclusive production, both in current and target fragmentation regions, provide a variety of spinand azimuthal angle dependent observables, sensitive to the dynamics of quark-gluon interactions.Studies of the 3D PDFs are currently driving the upgrades of several existing facilities (JLab, COM-PASS and RHIC), and the design and construction of new facilities worldwide, in particular theElectron Ion Collider.In this lectures, we will present an overview of the current status and some future measurementsof the orbital structure of nucleons and nuclei at Jefferson Lab and future EIC.

Primary author: AVAKIAN, Harut (Jefferson Lab)

Presenter: AVAKIAN, Harut (Jefferson Lab)



XV Hadron Physi … / Report of Contributions Bohr-Sommerfeld Quantization an …


Bohr-SommerfeldQuantization and the TetraquarkSpectroscopy

Tetraquark spectroscopy can be theoretically studied with lattice QCD, QCD sum rules and quarkmodels. In all these approaches the results are obtained numerically. It would be useful to havean analytical formula for the energy levels of the tetraquark systems. In this work we constructan analogue of the Bohr model (of the hydrogen atom) and apply it to tetraquarks. We derivean expression for the energy levels which depends on the principal (n) and angular (l) quantumnumbers.

Primary author: Mr TERRA, Ríchard (IFUSP)

Presenter: Mr TERRA, Ríchard (IFUSP)



XV Hadron Physi … / Report of Contributions Cold quark matter with heavy qua …


Cold quark matter with heavy quarks and thestability of charm stars

We study the effects of heavy quarks on the equation of state for cold and dense quark matterobtained from perturbative QCD, yielding observables parametrized only by the renormalizationscale. We investigate the behavior of charm quark matter under the constraints of β-equilibriumand electric charge neutrality in a region of densities where perturbative QCD is in principle muchmore reliable. We also analyze the stability of charm stars, and find that such quark stars areunstable under radial oscillations.

Primary authors: JIMÉNEZ APAZA, José Carlos (Universidade Federal do Rio de Janeiro); Prof.FRAGA, Eduardo (Universidade Federal do Rio de Janeiro)

Presenter: JIMÉNEZ APAZA, José Carlos (Universidade Federal do Rio de Janeiro)



XV Hadron Physi … / Report of Contributions Isolated photon production in the …


Isolated photon production in the color dipolepicture

A phenomenological study of the isolated photon production within the color dipole formalism isperformed. Using the dipole approach we investigate the isolated photon cross section differentialin the transverse momentum of the photon in pp collisions at RHIC and LHC energies consider-ing three different phenomenological models for the dipole cross section. The predictions for therapidity dependence of the nuclear ratio is also presented. As a further test of the color dipoleformalism, we study also the correlation function in azimuthal angle between the photon and aforward pion ∆ϕ for different energies and photon rapidites. The characteristic double-peak struc-ture of the correlation function around ∆ϕ ≃ π found for photons at forward rapidities in pp andpA collisions can be tested by future measurements.

Primary authors: N. LIMA, Yuri; GONCALVES, Victor (Universidade Federal de Pelotas); DrPASECHNIK, Roman (Department of Astronomy and Theoretical Physics); SUMBERA, Michal (NuclearPhysics Institute ASCR)

Presenter: N. LIMA, Yuri



XV Hadron Physi … / Report of Contributions PNJL model at zero temperature: e …


PNJL model at zero temperature: effects on thequarkyonic phase

The Polyakov-Nambu-Jona-Lasinio (PNJL) is an effective quark model incorporating confinementeffects in the original Nambu-Jona-Lasinio (NJL) one through the inclusion of the Polyakov loop(Φ) at finite temperature regime. However, at zero temperature regime, the structure of the PNJLmodel completely loses information on the Polyakov loop. Its equations become the same as theNJL model. In this work, we propose a modification in scalar and vector coupling strengths ofthe two flavors PNJL model by making them dependent on the Polyakov loop. As a constraint,we require that all interactions disappear at deconfinement phase (free quarks regime). We alsoadd a specific term dependent on Φ in the grand canonical potential of the model, that favorsnonvanishing Φ solutions, and limits Φ to Φ = 1. As a consequence, at zero temperature regime,all PNJL equations of state exhibit a~Φ dependence, unlike the original model. We name this newversion of the model as PNJL0. We discuss here its thermodynamics, focusing on the first orderphase transitions and the quarkyonic phase, now present at T = 0. Another discussion is whatthe parameters GV and a3 (parameter of the Polyakov potential) affects in the quarkyonic phase.

Primary author: ARDIZZON MATTOS, Odilon (Instituto Tecnológico de Aeronáutica (ITA))

Co-authors: LOURENÇO, Odilon (Instituto Tecnológico de Aeronáutica); Prof. FREDERICO, To-bias

Presenter: ARDIZZON MATTOS, Odilon (Instituto Tecnológico de Aeronáutica (ITA))



XV Hadron Physi … / Report of Contributions Nucleon axial and pseudoscalar fo …


Nucleon axial and pseudoscalar form factors in acontact interaction approach to QCD.

We will present preliminary resuls of the axial and pseudoscalar form factors of the nucleon cal-culated using a Poincaré-covariant, symmetry-preserving treatment of a vector×vector contactinteraction.

Primary author: Mr SERNA ALGARÍN, Fernando

Presenter: Mr SERNA ALGARÍN, Fernando



XV Hadron Physi … / Report of Contributions Neutrino absorption by the Earth’s …


Neutrino absorption by the Earth’s interior atultrahigh energies

Ultrahigh energy neutrinos are one of the components of the spectrum of particles that reach theEarth. In particular, astrophysical neutrinos have been observed with energies above 5 PeV, whichallow us to study the neutrino absorption by the Earth’s interior at ultrahigh energies. The opacityof the Earth to ultrahigh energy (UHE) neutrinos is strongly dependent on the behaviour of theneutrino-nucleon cross-section, σνN , in the kinematic region of very small values of Bjorken-xand large virtualities Q2, which was not explored by the HERA measurements of the structurefunctions. As a consequence, the predictions for the neutrino absorption depend on the descriptionof the QCD dynamics at small-x.Our goal in this contribution is to extend previous studies for the analysis of the high energybehaviour of σνN and estimate the impact on the neutrino absorption. In particular, we updatethe results based on Color Glass Condensate (CGC) formalism and present, for the first time, thepredictions based on the linear BFKL dynamics.

Primary authors: QUADROS, Alex (Universidade Federal de Pelotas (UFPel)); GONCALVES, Victor(Universidade Federal de Pelotas); Dr GRATIERI, Diego

Presenter: QUADROS, Alex (Universidade Federal de Pelotas (UFPel))



XV Hadron Physi … / Report of Contributions Exotic and conventional quarkoni …


Exotic and conventional quarkonium at Belle II

The Belle II experiment at the SuperKEKB energy-asymmetric e+e− collider is a substantialupgrade of the B factory facility at KEK in Tsukuba, Japan. The experiment began full operationin early 2019 and aims to record a factor of 50 timesmore data than its predecessor. Belle II is uniquely capable of studying the so-called “XYZ”particles: heavy exotic hadrons consisting of more than three quarks. First discovered by Belle,these now number in the dozens, and represent the emergence of a new category within quantumchromodynamics. This talk will present recent results in new Belle II data, and future prospects toexplore both exotic andconventional quarkonium physics.

Primary author: Prof. PERUZZI, Ida (Laboratori Nazionali di Frascati dell’INFN)

Presenter: Prof. PERUZZI, Ida (Laboratori Nazionali di Frascati dell’INFN)



XV Hadron Physi … / Report of Contributions Double parton scattering mechani …


Double parton scattering mechanism for associated cand b quark production in ultraperipheral collisions

AA.

The double–parton scattering (DPS) at the hadron coliiders such as the LHC is sensitive to corre-lations in the double–parton distributions. When looking at inclusive observables, it is dominatedat high energies (small x) by the interaction of 4 gluons in the initial state. In order to extractdifferent information about the partons, we are interested in the interaction between two gluonsand two photons. To do so, we look at the associated c and b quarks production in the DPS processin ultraperipheral collisions (UPCs)AA. We derive an analogue of the pocket formula for this DPSand the photon-energy dependent effective cross section at high energies. We provide numericalpredictions for this DPS cross sections at the typical energies of the LHC and FCC colliders.

Primary author: HUAYRA PAITAN, EDGAR (UFSC)

Co-authors: DE OLIVEIRA, Emmanuel (UFSC); Dr PASECHNIK, Roman (Lund University)

Presenter: HUAYRA PAITAN, EDGAR (UFSC)



XV Hadron Physi … / Report of Contributions Probing the photon distribution vi …


Probing the photon distribution via double partonscattering in ultra-peripheral heavy ions collision

In high energy hadron–hadron collisions, the process of Double PartonScattering (DPS) becomes important, in which two partons from onehadron interact simultaneously with two from another one.

In this work, we will consider the production of a pair of leptons anda pair of quark-antiquark from a ultra-peripheral ultra-relativisticheavy ion collision.

Unlike the commonly explored four–gluon DPS, in our case we take aphoton-photon interaction together with a photon-gluon interaction.

This provides us the opportunity to explore the photon distributionboth outside and inside the nucleus and also possible photon–gluoncorrelations.

In order to do so, the equivalent photon number through theWeizsäcker-Willians method with realistic charge distribution will bereviewed.

We obtain, using two simple parton scattering (SPS) cross sections(one for each interacting pair), the DPS pocket formula; we alsoobtain the relevant effective cross section with dependence inlongitudinal momentum fraction.

Primary author: Mrs DE OLIVEIRA STAHLHOFFER, Bruna (UFSC)

Presenter: Mrs DE OLIVEIRA STAHLHOFFER, Bruna (UFSC)



XV Hadron Physi … / Report of Contributions Exotic heavy mesons with charm a …


Exotic heavy mesons with charm and strangeness

In a recent work we have studied three-body scattering, considering theDDK system, in a coupledchannel approach. All input two-body scattering matrices have been obtained by solving Bethe-Salpeter equations for different channels coupling to same quantum numbers. The lowest orderamplitudes for the two-body subsystems are obtained from a Lagrangian based on the heavy quarksymmetry. We have investigated the contributions of three-body contact terms and find that thereexists a cancellation among the different sources of contact terms. Such a test has been madewith Lagrangians based on heavy quark as well as SU(4) symmetries. The resulting amplitudeshows that a three-body bound state should exist, with double charm and positive strangeness. Ina separate study we have investigated a hidden charm and positive strangeness system DD̄∗K ,which we treat as KX(3872) and KZ(3900) coupled channels, where we find a heavy K∗ stateformed. The results from both studies will be discussed in the talk.

Primary author: MARTINEZ TORRES, Alberto (IFUSP)

Presenter: MARTINEZ TORRES, Alberto (IFUSP)



XV Hadron Physi … / Report of Contributions Study of prompt photon productio …


Study of prompt photon production at the CERNLHC energies

We study the prompt photon production at the CERN LHC energies considering the color dipoleapproach. We estimate the rapidity and transverse momentum distributions of prompt photonproduction considering the more recent phenomenological models for the dipole-proton scatteringamplitude, which are able to describe the inclusive and exclusive ep HERA data. A comparisonbetween the predictions from distinct models for the dipole cross section is done, which is expectedto allow us to improve our understanding of the QCD dynamics and be important at the forwardrapidities in pp and pA collisions at the LHC.

Primary authors: SAMPAIO DOS SANTOS, Gláuber (Universidade Federal do Rio Grande doSul); DA SILVEIRA, Gustavo Gil; MACHADO, Magno (IF-UFRGS)

Presenter: SAMPAIO DOS SANTOS, Gláuber (Universidade Federal do Rio Grande do Sul)



XV Hadron Physi … / Report of Contributions Gauge Theories on the Lattice


Gauge Theories on the Lattice

Gauge symmetries are pervasive in particle physics, guiding the formulation of all interactionswithin the Standard Model. Usual methods for the calculation of processes, observables and prop-erties of particles rely on perturbative expansions, which fail to converge for non-abelian gaugetheories in the low-energy regime. The lattice formulation of a gauge theory, inherently non-perturbative, provides an alternative for these methods. In it the Lorentz symmetries are brokenbefore taking the limit to the continuum because of the space-time discretization implemented bythe lattice (in which the spacing between sites acts as an ultraviolet regulator making the theoryfinite), but gauge symmetry is kept exact at all steps. Moreover, one works in Euclidean space-time, which allows one to use tools from Statistical Mechanics. We present an introduction to theformulation of pure gauge theories on the lattice, comparing numerical simulations for differentgroups (SU(2) and SU(3)) and algorithms (Metropolis and Heat Bath), and examining the behaviorof the “plaquette” observable, which plays an important role in the lattice formulation of the gaugeaction.

Primary authors: MARQUES LEAL JUNIOR, Jesuel (University of São Paulo - São Carlos Instituteof Physics); MENDES, Tereza

Presenter: MARQUES LEAL JUNIOR, Jesuel (University of São Paulo - São Carlos Institute ofPhysics)



XV Hadron Physi … / Report of Contributions K* suppression in a hadron gas


K* suppression in a hadron gas

In the initial stage of a relativistic heavy ion collision a plasma of quarks and gluons (QGP) iscreated. The QGP expands, cools down and becomes a hadron gas made by, among other particles,the strange mesons K and K. Previous statistical models were unable to explain the measured ratio,K/K, of the strange meson abundances. In a previous work (by Cho and Lee, 2018) the observedsuppression of Kwas attributed to the interaction between mesons in the hadron gas. They were ableto reconcile the predictions of the statistical model with experimental data. However, as was pointedout in a subsequent work (Martinez et al, 2018), several important reaction mechanisms of interactionbetween mesons had been neglected. The authors recalculated the cross sections for production andabsorption of K and K mesons. The present work brings those two together making an estimateof the effect of considering such new cross sections in the K*/K yield ratio. Our results showthat these other mechanisms are indeed relevant to understand the strange mesons abundanceevolution through time during hadronization and still predicts a similar final yield ratio.

Primary authors: Mrs M. LE ROUX, Chiara (Instituto de Física da Universidade de São Paulo(IFUSP)); Prof. SILVEIRA NAVARRA, Fernando (Instituto de Física da Universidade de São Paulo(IFUSP))

Presenter: Mrs M. LE ROUX, Chiara (Instituto de Física da Universidade de São Paulo (IFUSP))



XV Hadron Physi … / Report of Contributions Magnetic excitation in relativistic …


Magnetic excitation in relativistic heavy ioncollisions

In this note we study the conversion of nucleons intodeltas induced by a strong magnetic field in ultraperipheral relativistic heavy ioncollisions. The interactionHamiltonian couples the magnetic field to the spin operator,which, acting on the spin part of the wave function, converts a spin 1/2into a spin 3/2 state. We estimate this transition probability and calculate thecross section for delta production. This process can in principle be measured, since thedelta moves close to the beam and decays almost exclusively into pions. Forward pions maybe detected by forward calorimeters.

Primary author: Ms DANHONI, Isabella (USP)

Co-author: NAVARRA, Fernando (Institute of Physics / University of Sao Paulo)

Presenters: NAVARRA, Fernando (Institute of Physics / University of Sao Paulo); Ms DANHONI,Isabella (USP)



XV Hadron Physi … / Report of Contributions Improving the Drell–Yan probe of …


Improving the Drell–Yan probe of small x partons atthe LHC via an azimuthal angle cut

Predictions for Drell–Yan lepton pair production at low dilepton mass and small x at the LHCusually have a large scale dependence, that can be decreased through obtaining an optimal factor-ization scale. In this paper, we reduce this scale by imposing a cutoff in azimuthal angle betweenthe transverse momentum of the leptons, properly taking into account Sudakov effects. This wouldallows one to probe the parton distributions at smaller scales eliminating most of the current the-oretical uncertainty.

Primary authors: DE OLIVEIRA, Emmanuel (UFSC); YAMASAKI, Kendi (UFSC)

Presenter: DE OLIVEIRA, Emmanuel (UFSC)



XV Hadron Physi … / Report of Contributions Di-muon production from …


Di-muon production from neutrino-nucleoninteractions at IceCube in the color dipole formalism

A way to study deep inelastic scattering of high-energy neutrinos is by dimuon production. It canbe achieved viaW -boson exchange between a neutrino and a b-quark or s-quark, which producesa muon and a t-quark or c-quark. This quark decays into a trident including another muon, thusproducing two muon tracks. The IceCube experiment can detect this process at very high energies,probing the dynamics of small x structure functions. The present work aims to predict this crosssection in the color dipole formalism, in order to find evidence of saturation effects.

Primary authors: TERNES COIMBRA, Caetano (UFSC); DE OLIVEIRA, Emmanuel (UFSC); Prof.FAGUNDES, Daniel

Presenter: TERNES COIMBRA, Caetano (UFSC)



XV Hadron Physi … / Report of Contributions Thermal Relaxation of Neutron St …


Thermal Relaxation of Neutron Stars near the DirectUrca Onset

In this work we revisit the thermal relaxation of neutron stars. We focus particularly on the coolingof neutron stars whose mass is slightly greater than the value above which the direct urca processsets in. Considering different mechanisms for neutrino production in each region of the star, andworking with some equations of state whose saturation properties as well its predicted neutron starmaximum mass were previously tested with empirical values, we solve numerically the differentialequations of energy balance and heat transport for a star with macroscopical structure given bythe TOV equation. We show that the star in that condition exhibits neither a fast cooling, nor aslow cooling as they are commonly presented in the literature. Contrary to common behavior, itssurface temperature undergoes a second sudden drop and the relaxation time is unusually high,reaching a few hundreds of years in some extreme cases.

Primary author: SALES, Thiago José (Universidade Federal Fluminense)

Co-authors: NEGREIROS, Rodrigo (Universidade Federal Fluminense); DUTRA, Mariana (InstitutoTecnológico de Aeronáutica); LOURENÇO, Odilon (Instituto Tecnológico de Aeronáutica)

Presenter: SALES, Thiago José (Universidade Federal Fluminense)



XV Hadron Physi … / Report of Contributions A modified improved auxiliary var …


A modified improved auxiliary variable method(Hubbard-Stratonovich transformation)

The Hubbard-Stratonovich field (also called the mean field or the auxiliary field method) is a nu-merical method that uses an auxiliary variable in order to solve Gaussian integrations with an-harmonic terms on the exponential. Here, we modify the method for two cases. First we considera (classical) zero dimensional model where it is introduced two and three auxiliary variables. Thesecond case is a quantum mechanic an-harmonic oscillator with also two and three different aux-iliary variables.

Primary authors: JÚNIOR, Arlam (Universidade Federal de Goiás); BRAGHIN, Fabio L. (IF-UFG)

Presenter: JÚNIOR, Arlam (Universidade Federal de Goiás)



XV Hadron Physi … / Report of Contributions Nucleon Electromagnetic and Axia …


Nucleon Electromagnetic and Axial Form Factorswith a Light-front ConstituentQuark Model

In this work we study the effect of scalar spin coupling of constituent quarks on nucleon elec-troweak properties by introducing a two momentum scales wave function. By comparing the onescale wave function and the two scales wave function models, we found that the last case hasshown a reasonable description of static observables and of the ratio µpGEp/GMp in which thevalue of the zero of G_Ep appears at squared momentum transfer of about 15GeV^2. We havealso shown results for the axial coupling gA and Axial Nucleon form factor. The best result forgA was obtained when the parameters of the nucleon wave function model were such that theexperimental value of the neutron magnetic moment is reproduced.

Primary authors: Dr BARBOSA DE ARAÚJO, Wilson Roberto (Secretaria da Educação do Estadode São Paulo (SEDUC), DE Norte 2); SUISSO, Edson (Instituto Nacional da Propriedade Industrial); DEMELO, João Pacheco (Laboratório de Física Teórica e Computacional - UCS - UNICID); Prof. FRED-ERICO, Tobias; TSUSHIMA, Kazuo

Presenter: Dr BARBOSA DE ARAÚJO, Wilson Roberto (Secretaria da Educação do Estado de SãoPaulo (SEDUC), DE Norte 2)



XV Hadron Physi … / Report of Contributions SU(3) Modified higher order sigma …


SU(3) Modified higher order sigma model withglueballs and tetraquarks

An extended flavor SU(3) linear sigma model for scalar and pseudoscalar mesons coupled to glue-balls and tetraquarks is built based on one loop quark dynamics. For that, non linear functionsof the chiral invariant scalar and pseudoscalar mesons compositions and covariant couplings to(scalar and pseudoscalar) glueballs fields and tetraquarks fields are envisaged. By considering theDynamical Chiral Symmetry Breaking, numerical estimations for the leading coupling constantsand corresponding mesons masses are provided from choices of the original parameters.

Primary authors: MARQUES MENDES, João Gabriel (Universidade Federal de Goiás); DE MELO,Igor; BRAGHIN, Fabio L. (IF-UFG)

Presenters: MARQUES MENDES, João Gabriel (Universidade Federal de Goiás); DE MELO, Igor



XV Hadron Physi … / Report of Contributions Masses of mesons with a b-quark …


Masses of mesons with a b-quark from a U(5)quark-NJL model

A flavor quark - level U(5) Nambu Jona Lasinio model is considered for the derivation of an effec-tive model for heavy scalar and pseudoscalar mesons. Relations between scalar and pseudoscalarquark-antiquark mesons masses with at least one b or b̄ - quark. The mesons normalization con-stants are found by considering explicit chiral symmetry breakdown. For that, the auxiliary fieldmethod is considered for the generating functional of the model by means of its usual formulation.With the dynamical breakdown of chiral symmetry the scalar quark condensates contributions forthe scalar and pseudoscalar mesons masses are investigated at one loop level. Relations betweenthe mesons masses are presented.

Primary authors: FERREIRA DE SOUSA, Willian (IFG / UFG); BRAGHIN, Fabio L. (IF-UFG)

Presenter: FERREIRA DE SOUSA, Willian (IFG / UFG)



XV Hadron Physi … / Report of Contributions Gluon Correlations in Lattice Gau …


Gluon Correlations in Lattice Gauge Theory at FiniteTemperature

The behavior of the strong coupling constant at low energies requires a non-perturbative theory todescribe these phenomena. The formalism of lattice QCD provides such a method, as it involves theequivalence between a quantum field theory in Euclidean space and a classical statistical mechanicsmodel, obeying a probability density. Beside that, the lattice formulation implies a discretizationof space-time, so that the quarks are defined on the sites of a lattice and gluons on the links thatconnect these sites. We will describe the application of this formulation in SU(2) Yang-Mills the-ory at finite temperature, emphasizing the gluon propagator in Landau gauge. We will analyzethe behavior of this propagator around the critical temperature of the deconfinement transition,including screening mass effects associated to poles of these propagators. We characterize thecriticality using the finite-size-scaling method, applied to the Polyakov loop, which is the orderparameter of this transition. Preliminary results will be presented for different temperature andlattice-size values.

Primary authors: COSTA CERQUEIRA, Matheus; MENDES, Tereza

Presenter: COSTA CERQUEIRA, Matheus



XV Hadron Physi … / Report of Contributions On Magnetar’s cooling


On Magnetar’s cooling

The physics of Neutron Stars has been in a prominent position for the past few decades due to bothits interdisciplinarity and its growing observational possibility. In this work we investigate theinfluence of the magnetic field on the Neutron Star crust and its consequences on its observationalproperties. The Baym-Pethick-Sutherland (BBP) equation of state was used as an initial model,the effect of the external magnetic field is accounted for in electrons through Landau quantizationand suggests a crust instability in the case of extremely high magnetic fields. Thus, the possibilityof impact on the cooling behavior is evaluated, since it depends strongly on the properties of theoutermost layers of the star.

Primary author: MOREIRA, Leonardo (Universidade Federal Fluminense)

Co-author: NEGREIROS, Rodrigo (Universidade Federal Fluminense)

Presenter: MOREIRA, Leonardo (Universidade Federal Fluminense)



XV Hadron Physi … / Report of Contributions Hadron production at hard and so …


Hadron production at hard and soft momentumscales including gluon saturation

Although the collinear factorization formalism is the standard procedure to calculate the observ-ables in the context of perturbative QCD, it is predicted that the approximations related to thisapproach are not applicable in some cases. We present a investigation about the kT -Factorizationformalism at the high energy regime for both large and low scale phenomena, being the later usu-ally associated with the non-perturbative region of QCD. In our approach, we consider a gluondistribution function depending on the transverse momentum, and whose behavior are in accor-dance with both regimes mentioned above, allowing us to analyze the interface among these cine-matic regions of the QCD. For this purpose, we have used the saturation formalism, which foreseethe existence of a saturation momentum scale and leads to a gluon distribution whose growth islimited at high energies.

Primary author: MORIGGI, lucas (UFRGS)

Co-authors: PECCINI, Guilherme (UFRGS); MACHADO, Magno (IF-UFRGS)

Presenter: MORIGGI, lucas (UFRGS)



XV Hadron Physi … / Report of Contributions Radial Oscillations of White Dwar …


Radial Oscillations of White Dwarfs with FiniteTemperature

White dwarfs have, at the beginning of their lives, temperature inside their structures. This temper-ature modifies the way interstellar matter behaves, since degeneration is no longer found through-out the entire star. An effective assumption for the structure of hot white dwarfs is to considertheir cores as a degenerated Fermi gas, as in the case of T = 0K, and its surface as an ideal gaswith temperature. The ideal gas with temperature in the envelope increases its radius and thismay modify the star stability. This work aims to study the relationship between stability and theincrease in radius due to temperature using a necessary criterion, turning-point, and a sufficient,the radial stability.

Primary author: Ms NUNES, Sílvia (Instituto Tecnológico de Aeronáutica)

Co-authors: Prof. MALHEIRO, Manuel (Instituto Tecnológico de Aeronáutica ); Prof. ARBAÑIL,José Domingo (Universidad Privada del Norte)

Presenter: Ms NUNES, Sílvia (Instituto Tecnológico de Aeronáutica)



XV Hadron Physi … / Report of Contributions Magnetic monopoles for an arbitra …


Magnetic monopoles for an arbitrary gauge group

To understand the strong interaction, we need to clarify how color confinement occurs in QCD.One of the most promising scenarios of confinement is the dual superconductor picture, in whichmagnetic monopoles play a crucial role. In non-Abelian gauge theories, however, the definition ofmagnetic monopoles is not trivial because the naive definition of magnetic charge is not gauge in-variant. A way to define gauge invariant magnetic charge in non-Abelian gauge theories is the fielddecomposition, which is used to extract the monopole contribution to the static quark-antiquarkpotential. We extend this method so far for SU(N) to an arbitrary connected compact Lie group.This should be useful to understand confinement because confinement occurs irrespective of thegauge group.

Primary author: MATSUDO, Ryutaro (Chiba University)

Co-author: Prof. KONDO, Kei-Ichi (Chiba University)

Presenters: MATSUDO, Ryutaro (Chiba University); Prof. KONDO, Kei-Ichi (Chiba University)



XV Hadron Physi … / Report of Contributions Efimov signatures of the K(1460) r …


Efimov signatures of the K(1460) resonance

The Efimov effect is a counterintuitive phenomenon concerning three non-relativistic particleswith pairwise interactions supporting only one very shallow, two-particle bound state. In the so-called unitary limit, where the two-particle bound state energy goes to zero, the three-particlespectrum exhibits an infinite tower of bound states geometrically separated by a constant factor∼ 515. Efimov physics deals not only with the strict unitary regime, but also with the richerphenomenology slightly away from it, as long as the two-particle energies can still be consideredshallow.

Observations of Efimov physics appear in cold atom experiments where the two-atom interactionscan be tuned at will around the unitary regime via Feshbach resonance. In hadron physics, thereare attempts at investigating some heavy exotic mesons as two- and three-body molecules andlooking for universal correlations that are signatures of the Efimov effect. In this work we moveaway from the heavy quark sector, investigating a system with two kaons and one anti-kaon. Themotivation is the shallow energies of the a0 (∼ 12 MeV) and f0 (∼ 2 MeV) below the two-kaonthreshold. We present results for observables and evidence of universal correlations in theK− f0and K − a0 scattering and the K(1460) state as candidate of an Efimov state.

Primary author: Prof. HIGA, Renato (Instituto de Fisica, Universidade de Sao Paulo)

Co-author: Mr FERNANDES LUIZ, Rafael (Instituto de Fisica, Universidade de Sao Paulo)

Presenter: Prof. HIGA, Renato (Instituto de Fisica, Universidade de Sao Paulo)



XV Hadron Physi … / Report of Contributions 1-loop Correction Calculations for …


1-loop Correction Calculations for RGZ Propagator

The phenomenon of confinement is still an open problem and so many models and/or methods areproposed to try to explain it. The Gribov-Zwanziguer (GZ) model is one example of this, proposedto try to describe the gluon propagator. However it was shown to be incompatible when comparingwith the lattice QCD results, which is at the moment our well-established comparison source fornon-perturbative approaches since quantitative predictions at this level are more difficult to make(calculate). This model was refined and then appears the refined Gribov-Zwanziguer (RZG) model.Now it shows to have, at least at the tree level propagator, a good agreement with the lattice data fora range of low moment values. So, at first, the focus of this work is to present some techniques andtools used to calculate 1-loop correction of the RGZ propagator, since this calculation proves to bequite tricky (showing what has been achieved so far). Then we see if there will be an improvementor not in the propagator agreement range and possible new model

Primary authors: VITALINO DA SILVA, Apóllo (UERJ); MINTZ, Bruno (UERJ - Universidade doEstado do Rio de Janeiro (Brazil))

Presenter: VITALINO DA SILVA, Apóllo (UERJ)



XV Hadron Physi … / Report of Contributions Studying the system KDD̄∗ with …


Studying the system KDD̄∗ with effective theories

The existence of exotic mesons and baryons, whose masses, widths and/or quantum numbers cannot be explained within the constituent quark model of Gell-Mann and Zweig, is one of the pecu-liar characteristics of Quantum Chromodynamics which has been, and still is being, intensivelyexplored in experiments and in theory. Typical examples are: the scalar nonet in the meson sec-tor, which includes the f0(500), κ(800), f0(980), a0(980) states, and the Λ(1405) in the baryonsector. With the increase of the accessible energy range by the experimental facilities, claims forthe observation of such states, especially in the heavy quark sector, with a hidden charm content,started appearing in the last decade, as the so called X , Y and Z families. In case of the Z family,consisting of charged particles with masses in the charmonium mass range, 3.9−4.2 GeV, at leasttwo quarks and two antiquarks are necessarily required, with a cc̄ pair being responsible for theirheavier masses. The isoscalar partners, belonging to the X and Y families, are also categorizedas exotic, not due to the fact that to obtain their quantum numbers we need to invoke a differ-ent structure to that of qq̄, but because their masses and widths cannot be explained within thetraditional constituent quark model.

All these heavy exotic mesons found experimentally in the recent years share a common feature:they are mesons with no strangeness. A glance at the Particle Data Book (PDB) shows a low activityin the strange pseudoscalar and vector meson sectors since the last 30 years: in the pseudoscalarsector, the last I(JP ) = 1/2(0−) Kaon state reported corresponds to K(1830). Its existence wasclaimed in 1983 from a partial wave analyses of theK−ϕ system produced in the reactionK−p→K+K−K−p, and, recently, the LHCb collaboration took it into account in the amplitude analysisof theB+ → J/ψϕK+ decay. Similarly, in the vector sector, the latest I(JP ) = 1/2(1−)K∗ statelisted in PDG is the K∗(1680), whose existence dates to experiments and partial wave analysisperformed during 1978-1988. As in the case of K(1830) also, the LHCb collaboration has recentlyconsidered its existence in the analysis of the amplitude for the decay process B+ → J/ψϕK+.And, overall, the final excited state in the meson sector, with nonzero strangeness quantum number,reported in the PDB corresponds to K(3100), whose quantum numbers are unknown, and whichwas observed in several Λp̄(Λ̄p)+pions reactions during the years 1986-1993.

In the present work, we investigate the possibility of forming a meson K∗ in the three-bodyKDD̄∗ system. All the two-body interactions, KD, KD̄∗ and DD̄∗, are stringently constrainedby a large number of experimental (D∗

s0,D∗s1, X(3872) and Zc(3900)) as well as the lattice QCD

data, which lead to a unique systemKDD̄∗. Using the so called fixed-center approximation (FCA)to the Faddeev equations, we found a heavy K∗ mesons around 4307 MeV with hidden charm.In order to provide more information, we continue with the investigation of the properties of theK∗ state predicted and calculate the decay widths to several open two-body channels. Particularly,we consider the channels J/ψK∗(892), D̄D∗

s , D̄∗D∗s and D̄Ds, which are the most relevant ones,

based on the nature ofK∗(4307). This information should be reliable for experimental searches ofthe K∗ state proposed, since the decay mechanism of the state is linked to the internal structureof the decaying particle.

Primary authors: MARTINEZ TORRES, Alberto (IFUSP); KHEMCHANDANI, Kanchan; MAL-ABARBA, Brenda

Presenter: MALABARBA, Brenda



XV Hadron Physi … / Report of Contributions An introductory study of …


An introductory study of Schwinger-Dysonequations

Since centuries ago, Science seeks to understand nature. How did the Universe come about? Whatare we made of? These and other issues are still under discussion. However, an issue that hasbeen the basis for the study in Quantum Chromodynamics (QCD) is the origin of the mass ofsubatomic particles. We know that 95% of the hadron mass comes from the strong interaction.QCD study has become very important in Physics. One of the most known methods for workingwith QCD is the perturbative, but it has some restrictions and inconsistencies between theory andexperiments. An alternative is non-perturbative methods, among which the Schwinger-DysonEquations stand out. Such method has shown significant results when compared to experiments,such as the convergence of the gluon propagator at low energies, which does not occur in theperturbative.Our goal is to present how to use the Schwinger-Dyson method to solve problems in QuantumField Theory, compared to perturbative methods.

Primary authors: SANTOS, Kevin (Universidade do Estado do Rio de Janeiro); MINTZ, Bruno(UERJ - Universidade do Estado do Rio de Janeiro (Brazil))

Presenter: SANTOS, Kevin (Universidade do Estado do Rio de Janeiro)



XV Hadron Physi … / Report of Contributions Lee-Wick field in presence of semi- …


Lee-Wick field in presence of semi-transparentboundaries

In this study I analyze the scalar and vectorial Lee-Wick field, achieving analytically the propa-gator and numerically the energy and force. It is analyzed the interaction between charge and aconductive plate, which simulates a semi-transparent mirror. For both cases, scalar and vectorial,the interaction force shows extrema points for finite values of the Lagrangian coupling parameters.The analysis of extrema cases shows that these parameters generate consistent results previouslyobtained.

Primary author: EVERSON HENRIQUE, Rodrigues

Presenter: EVERSON HENRIQUE, Rodrigues



XV Hadron Physi … / Report of Contributions Femtoscopy of the origin of the pr …


Femtoscopy of the origin of the proton mass

Femtoscopic measurements of quarkonium-nucleon (QN) momentum correlationfunctions in high-energy heavy-ion collisions allow us to access information on the QN scatteringamplitude. This forward amplitude is proportional to a matrix element of gluon fields inside thenucleon. This matrix element comes from the trace anomaly in the QCD energy-momentum tensor,and it gives most of the proton mass. In the chiral limit, it gives all of the proton mass. I willpresent results of an ongoing study employing models for the QN interaction to compute the QNmomentum correlation function. I will discuss the perspectives of measuring such correlationfunctions at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC).

Primary author: Prof. KREIN, Gastão (IFT - UNESP)

Presenter: Prof. KREIN, Gastão (IFT - UNESP)



XV Hadron Physi … / Report of Contributions Highlights on charm and beauty d …


Highlights on charm and beauty decays from LHCbexperiment

In this talk we present the recent results from LHCb experiment, related to hadronic final statesfrom beaty and charm decays.

Primary author: BEDIAGA, Ignacio (Elisa Carmen Hickman de Bediaga)

Presenter: BEDIAGA, Ignacio (Elisa Carmen Hickman de Bediaga)



XV Hadron Physi … / Report of Contributions Absorption effects in leading neut …


Absorption effects in leading neutron production

In eletron-proton and proton-proton colliders, leading neutron production occurs when a proton(or both) splitts into a neutron and a pion. This process allows us to study pion-pion collisions atthe LHC by selecitng events in which two neutrons are measured by the Zero Degree Calorimeters.In previous works we have shown that processes with leading neutrons are useful to the study ofgluon saturation. In all cases we have to deal with rescattering effects. Assuming that the targetproton splitts into a neutron plus a pion, the projectile proton (or photon) hits the pion but itcan also scatter off the neutron. This last process was accounted for with the introduction ofan absorption parameter known in the literature as kappa. In this work, we have improved ourprevious calculations replacing the parameter kappa by a dynamical model of rescattering. Weobtain a very good description of the measured leading neutron spectra measured at HERA.

Primary authors: CARVALHO , F.; GONÇALVES , V.P.; NAVARRA, Fernando (Institute of Physics/ University of Sao Paulo); SPIERING, D.

Presenter: NAVARRA, Fernando (Institute of Physics / University of Sao Paulo)



XV Hadron Physi … / Report of Contributions Multiple parton interaction in a …


Multiple parton interaction in a QCD-inspired model

We explore an update of the Lipari-Lusignoli model for multiple parton interaction in proton-pronton (pp) and antiproton-proton (p̄p) collisions considering the recently released LHC precisemeasurements at

√(s) = 13 TeV. By means of a multi-channel eikonal model where the diffractive

excitations are obtained using the Good-Walker approach, we give predictions to the total andelastic cross-sections where the soft sector is written based on Regge-Gribov phenomenology andthe hard sector is given by the usual perturbative QCD cross-section within an updated partondistribuition function CT14.

Primary authors: BROILO DA ROCHA, Mateus (Federal University of Pelotas); GONCALVES,Victor (Universidade Federal de Pelotas); SILVA, Paulo VRG (Universidade Federal de Pelotas)

Presenter: BROILO DA ROCHA, Mateus (Federal University of Pelotas)



XV Hadron Physi … / Report of Contributions Short-range correlations effects on …


Short-range correlations effects on the deformabilityof neutron stars

In the present work, we investigate the effects of short-range correlations (SRC) on the dimension-less deformability of the binary neutron system related to the GW170817 event. We implementedphenomenological SRC in a relativistic mean-field model in which the bulk parameters, namely,incompressibility (K0), effective nucleon mass ratio (m∗), symmetry energy (J ) andits slope (J0), are independently controlled. Our results point out that the SRC favor the model topass through the constraints, established by the LIGO/Virgo Collaboration, on the values of Λ1.4

and on the Λ1×Λ2 region. We also found a clear linear correlation between Λ1.4 with K0 and L0

(increasing dependence), and with m∗ and J (decreasing dependence). Finally, we also obtainedcompatible numbers for R1.4 (model with and without SRC) in comparison with recent data fromthe Neutron Star Interior Composition Explorer (NICER) mission.

Primary authors: DE SOUZA, Lucas Alves (Instituto Tecnológico de Aeronáutica); LOURENÇO,Odilon (Instituto Tecnológico de Aeronáutica); DUTRA, Mariana (Instituto Tecnológico de Aeronáu-tica); LENZI, César (ITA)

Presenter: DE SOUZA, Lucas Alves (Instituto Tecnológico de Aeronáutica)



XV Hadron Physi … / Report of Contributions Multi-loop corrections to mean- …


Multi-loop corrections to mean-field Phi4 theoryfrom stochastic quantization

Mean-field methods provide valid zeroth-order approximations for describing properties of manyphysical systems. Prominent examples of systems for which mean-field approximations are ap-propriate zeroth-order estimates include atomic nuclei and atomic condensates. While the approx-imation is in many circumstances corroborated by experimental observation of some qualitativefeatures of the system, it fails to describe observables driven by quantum fluctuations, which ingeneral are not captured by mean-field approximations. In the present work, we implement aressumation scheme in 2, 3 and 4 dimensions for the Φ4 theory model in which the contributionsof quantum fluctuations to observables are expressed as a power series in ℏ. The scheme is basedon the Parisi and Wu stochastic quantization method in Euclidean space, in which quantum fluc-tuations are taken into account through a Langevin equation with a fictitious time variable anddriven by a noise source with strength proportional to ℏ. The original action of the model is recastinto a form that has the well-known mean-field contribution as calO(ℏ0) solution and quantumfluctuations of higher order in ℏ are described by an infinite set of coupled stochastic Langevinequations. These equations can be truncated and solved numerically in a straightforward way upto large powers of ℏ.

Primary author: MARQUES VALOIS, Adeilton Dean

Presenter: MARQUES VALOIS, Adeilton Dean



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