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Report of PAC for Particle Physics

T. Hallman

JINR Scientific Council MeetingJanuary 19-20, 2006

Dubna, Russia

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Recommendations on New Projects

The PAC recommends approval of the project “Measurement of the rare decay K+ + ̅ in the experiment at the CERN SPS (project OKAPI)” with first priority until the end of 2006 (10% measurement of CKM parameter |Vtd|)

The PAC recommends approval of the project “Experiments with charged kaons at the separated kaon beam of IHEP’s accelerator (project OKA) for execution with first priority until the end of 2006 (rare charged kaon decays (e.g. k+ e+ better senstivity by 2 orders of magnitude); low energy hadron interactions for tests of ChPT, Lattice QCD, CP violation in charge conjugate decays)

The PAC recommends approval of the project “A study of asymmetries of the spin and structure-dependent interactions of nucleons with polarized targets and beams (project NN and GDH)” for execution with first priority until the end of 2006 (three-nucleon forces in few body interactions; verification of GDH sum rule).

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Recommendations on Current Experiments

Projects scheduled for review in 2005 recommended to be continued until the end of 2006:

Development of the Nuclotron Accelerator Complex (first priority) Dirac (first priority) NIS (first priority) TUS (second priority) ALPOM (first priority) pHe3 (first priority) MARUSYA (first priority) Leading particles (second priority) Development of accelerators for radiation technologies (second priority) Analytical and methodological work to assess the prospects of scientific research

and cooperation in the main directions of JINR’s development (second priority)

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Recommendations on Closing Experiments

The PAC recommends closure of the following activities: DELPHI HARP/PS214 PoLID NN- interactions HYPERON-M HERA-B GAMMA-2 CERES/NA45 EXCHARM-II DISK WASA BES KAPPA SINGLET Energy Plus Transmutation

15-20% reduction in No. of projects

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JINR Particle Physics road map

ensure scientific excellence of JINR

maximize the scientific output within the resources

support and develop existing facilities and infrastructure

The role of the Road Map is to:

Draft

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Worldwide Priorities in particle physics

the origin of mass; the properties of neutrinos; the properties of the strong interaction

including properties of nuclear matter; the origin of the matter-antimatter

asymmetry in the universe; the unification of particles and forces

including gravity;

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HE

SE

JINR bearsFull Responsibility

ME1/1

JINRParticipate

JINR bearsFull Responsibility

HE

SEME1/1

JINRParticipate

HE

SE

JINR bearsFull Responsibility

JINR bearsFull Responsibility

ME1/1

JINRParticipate

JINRParticipates

JINR in the CMS Physics Program

Search for the HIGGS; Origin of Mass; Super Symmetry

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The field of special interest of Dubna group is study of Drell-Yan processes in the large invariant mass region

The idea is to test Standard Model calculations for muon pairs production up to the highest reachable invariant masses

Many theoretical predictions suggest possible violation of the SM Unique opportunity to test the SM up to 3-5 TeV mass region (Tevatron region is

limited only of 0.8 TeV) Study facilitated by excellent performance of CMS Muon system Possibility of strong theoretical support of this research program st JINR

The field of special interest of Dubna group is study of Drell-Yan processes in the large invariant mass region

The idea is to test Standard Model calculations for muon pairs production up to the highest reachable invariant masses

Many theoretical predictions suggest possible violation of the SM Unique opportunity to test the SM up to 3-5 TeV mass region (Tevatron region is

limited only of 0.8 TeV) Study facilitated by excellent performance of CMS Muon system Possibility of strong theoretical support of this research program st JINR

JINR in CMS Physics

At the stage of data taking and physics analysis JINR CMS project will be organized as a joint effort of several groups from LPP, LHE, LPP and LIT distributed following task forces:

Data taking and technical support group (LPP and LHC) Input data control and processing (production) (P.Moissenz + 4,LPP) Data processing (V.Korenkov + 5, LIT) Physics analysis (S.Shmatov + 5, LPP) Theoretical support (O.Teryaev, D.Bardin, BLTP)

At the stage of data taking and physics analysis JINR CMS project will be organized as a joint effort of several groups from LPP, LHE, LPP and LIT distributed following task forces:

Data taking and technical support group (LPP and LHC) Input data control and processing (production) (P.Moissenz + 4,LPP) Data processing (V.Korenkov + 5, LIT) Physics analysis (S.Shmatov + 5, LPP) Theoretical support (O.Teryaev, D.Bardin, BLTP)

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The ATLAS Detector at the CERN LHC

Search for the HIGGS; Origin of Mass; Super Symmetry

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Some JINR topics are the following:

Search for the SM Higgs boson with the ATLAS detector via the process H → 4μ (G.Chelkov, I.Boiko, K.Nikolaev, R.Sadikov)

Other Dubna proposals are to utilize the ATLAS large-mass Higgs discovery potential by means of reactions H→2W→2l, or H→2W→l jj (Yu.Kulchitsky) and H→2Z→2l , or H→2Z→lljj (V.Vinogradov) on the basis of the already simulated ATLAS DC1 and DC2 data. The proposals rely on the Higgs boson production via the Vector Boson Fusion mechanism (the two accompanied forward jets allows very good background reduction) and on the maximal Higgs boson decay rates into WW- or ZZ-pair at MHIGGS = 400 -- 1000 GeV.

Preparing to do science with ATLAS

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JINR preparations for physics with ATLAS : H μμμμ

Study of Higgs Boson Decays H μμμμ

(Boyko I., Chelkov G., Nikolaev K.)

Using the full simulation of ATLAS detector

Study effects of pile-up

Background study.

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JINR Preparations for science with ALICE

TRDElectron IDTRDElectron ID

PHOS, 0 PHOS, 0

MUON pairs MUON pairs

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Planned JINR Scientific Analyses on ALICE

1. Study of hot and dense nuclear matter in nuclear – nuclear (AA) collisions in the frame of QCD predictions:

Light resonance ( , , ) production; Chiral symmetry restoration;

Particle correlations; Space-time evolution and interferometry (HBT) measurements.

Heavy-quark and quarkonium ( J/, families) production. Quarkonium suppression (Dimuons decay mode; Di-electrons decay mode).

Direct photon production. ‘Prompt’ photon characteristics and two-photons correlation.

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Physics Simulation in ALICE -- Particle Identification:

Particle identification with Inner Tracking System and Time Projection Chamber

Simulation of Φ K+K- including the tracking and detector (ITS,TPC) efficiencies

Development of New Cluster finder

Finding Algorithm

The Study of the HBT Correlations

480 HIJING events

480 HIJING events

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Effective mass distribution of (K+K-) paires.

Particle identification switched on!

The resonance peak after(K+K+) background subtraction.

Mass and width BW fit parameters are respectively: 1019.60 ± 0.04 MeV and

4.30 ± 0.12 MeV.

For the BW fit the gaussian effective mass resolution (1.23 MeV) has been taken into account by a convolution of BW and gaussian functions..

The S/B increases from 0.5% at the lowest pT(K+K-) < 0.6 GeV/c to 6.2% atthe highest pt > 2.2 GeV/c with the significance equal to 120.)/( BSS

Physics With ALICE

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Detection of Upsilons in p-Pb and Pb-p collisions in ALICE muon spectrometer ( pt > 3GeV/c)

bb̃ BGR & Signal

p-Pb

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High-throughput Telecommunication Data Links and Local Area Network Backbone

Development of external JINR computer communications: a) a high-speed 1 Gbps JINR-Moscow data link, b) JINR participation in the new-generation research computer network with Russian and international (GLORIAD, GEANT) segments for provision of JINR’s activities, c) integration with the educational network of Dubna.

1Gbps link to Moscow

2 November - Test run started

At present the JINR LAN comprises more than 5300 computers and nodes. Main goal: carrying out organizational and technical measures to provide the 1 Gbps data transfer rate across the JINR LAN.

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Central computer complex and Grid segment - Development of the JINR CICC as a core of the distributed infrastructure,used by 17 experiments (ATLAS, CMS, ALICE, HARP, COMPASS, DIRAC, D0, NEMO, OPERA, HERMES, H1, NA48, HERA-B, STAR, KLOD, etc.) - Development of distributed computing infrastructure according to the requirements of collaborations and users of the JINR CICC as tabulated:

Year 2005 2006 2007 2010 2015

CPU(kSI2000)

100 660 1000 4000 10000

Disk Space(TB)

50 200 400 800 4000

Tape(TB) 1.5 50 450 1000 6000

LHC Computing Grid Project (LCG)• LCG software testing;• evaluation of new Grid technologies (e.g. Globus toolkit 3) in a context of using in the LCG;• event generators repository, data base of physical events: support and development.

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Tier1/2 Network Topology

LIT support of LHC LIT support of LHC experiments on CCIC:experiments on CCIC:

ALICE ALICE - the software developed - the software developed by collaboration: by collaboration: AliEn2 - Data Challenge; AliEn2 - Data Challenge; own versions of ROOT;own versions of ROOT;AliRoot, Geant3, FLUKA - analysis AliRoot, Geant3, FLUKA - analysis and processingand processing

CMS - the software at LCG-2: VO-cms-CMKINVO-cms-OSCAR VO-cms-ORCA

ATLAS - the software: ATHENA (release 9.0.0 and higher), ROOT 4.04/02;TDAQ Monitoring and Control sub-systems; farm management

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Preparations are underway to realize the benefit of JINR’s contributions to the LHC and play a central role in the scientific programs of CMS, ALICE, and ATLAS

Activity getting underway to support a leading participation in the International Linear Collider

The exercise commissioned by the Directorate at the suggestion of the Scientific Council to streamline the particle physics program by reviewing the scientific priorities of the projects within the context of a realistic budget is continuing

Conclusions