ACPP Automated Calculation in Particle Physics France-Japan-Russia collaboration

Franco-Russia ForumDec. 6-7 2004

Denis Perret-GallixCNRS

Russian Academy of Science

ACPPAutomated Calculation in Particle Physics

France-Japan-Russia collaboration

Denis Perret-Gallix CNRS










Matter and Forces

“The standard model”




Why do we see matter and almost no anti-matter?

Unsolved Mysteries

What is this « dark matter » that we cannot see but has visible gravitational effects?

Why the « standard model» does not predict the mass ?

The Higgs Particle ?

CP violationBelle- Babar exp.

Why the neutrino mass is so small?




Are quarks and leptons actually fundamental, or made up of even more fundamental particles?

Why are there exactly three generations of quarks and leptons?

How does gravity fit into all of this?

Unsolved Mysteries

…

IV …




Beyond the “Standard Model”

Supersymmetry

M-theory and extra-dimensions









Russian Academy of Science LHC at CERN




























WMAP results

Universe expansion speeds up

• 70% dark energy

• 25% dark matter

• 5% matter and radiation

WMAP Photon temperature 2.73K

Comological constant anti-gravityEinstein: « My biggest mistake »




Experiment Simulation

A Mandatory Component of HEP experiments




Detectors Simulation Detectors

Event: E/P Quadri-vectors

Event: Hits, Energies, Timing

Event: E/P Quadri-vectors

Event: Hits, Energies, Timing

Reconstruction

Event Generator

Process

Physics Model Nature

Comparison

Event simulation







Event simulationat LHC




u g

g~ u~

PP

t

t-~

t-

1-~

W-

10

u-

dW+

b

s-

c

10

u

Multiple interaction/underlying event

Hard sub-process

Parton shower

Hadronization

Heavy Quarks

Hadron collider Physics



Russian Academy of Science Feynmandiagrams

Interaction

Computation




H+ t b at first order 1 at 1-loop 97 diagrams

Higher order calculations




What is automatic calculation ？

It is now impossible to perform accurate theoretical calculations by hand for collider experiments.

★Increasing the requested accuracyat LHC ～ 10% at ILC ～ 0.1%

Radiative Corrections LHC ～ 100% ， LC 　～ 10%

　　 ⇒” Tree” is not adequate.

Need higher order corrections!!

★ Multi-particle productions

　　　⇒ increasing the number of diagrams. J. Fujimoto







International Research Group

ACPP: Automated Calculation in Particle Physics

• 48 physicists from France, Russia, Japan– Russia:Russia: Lomonosov Moscow State Univ.(14), Russian Academy of Science(2)

– Japan:Japan: KEK: Minami-Tateya collaboration(19)

– France:France: CNRS(9), Univ. de Savoie, Clermont 2(1), Montpellier 2(2), Paris. 11(1)

• Main packages: Grace, Grace 1-L (28 pub), CompHEP, LanHEP, CalcHEP (30 Pub)

• For LHC, ILC, Astro-Particle PhysicsGRC4F (147 cit.), micrOMEGAs,…




Grace Package(Japan)



Russian Academy of ScienceComphep Package (Russia)







LEP II: GRC4Fa 4-fermion event generator for e+e- collisions

• Tree level helicity amplitudes produced by “GRACE” http://www-sc.kek.jp/minami/

• Fermion mass and full spin correlations included

• 76 4-fermion final states processes >2500 diag.

• ISR, FSR, Beamstrahlung

• Interface to Parton showers and hadronization (Pythia)

• Anomalous couplings

• hep-ph/9605312, Comp. Phys. Comm 100:128-156







Radiative Corrections to Higgs processes by GRACE

International Linear Collider

processes # of tree

(all)

# of 1-loop

(all)published

12 1350 Phys. Lett. B559(2003)252

12 2327 Phys. Lett. B571(2003)163

27 5417 Phys. Lett. B576(2003)152

42 4470 hep-ph/0407065

10 1099 Presented at ACAT03

44 6094 Presented at Loop&Legs(preliminary results)

81 19638 Presented at ECFA2004(Durham)

Hee

Httee

ZHHee

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Heeee

duee

HHee

J. Fujimoto




Httee hep-ph/0307029Phys.Lett.B 571(2003) 163.




micrOMEGAsLAPP-Moscow

• WMAP data put constraints on the Susy parametres

•LHC/ILC put constraint on Omega

The relic density of Dark Matter in supersymmetry2800 tree level processes (CalcHEP)




Automatic Calculations in Particle PhysicsACPP

• Mandatory for experiment designs and data interpretation

• A perfect case for International collaboration

• A pluridisciplinary program: Theory, Computing and experiments

• Very active collaboration – AIHEP/ACAT workshops (Advanced Computing and Analysis Techniques)

– Les Houches workshops




Automatic Calculations in Particle PhysicsACPP Future

• Theory developments for 1-loop, 2-loop processes

• Better interface with experiments (Standardization,…)

• Large computing power– Efficient symbolic manipulation package

– Singularity tolerant numerical integration algorithm

– High precision floating point calculation (quadruple/octuple precision)

– High performance parallel/farm systems

Higher precision predictions are required by coming projects: LHC, ILC, super-B factory, Planck, …

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ACPP Automated Calculation in Particle Physics France-Japan-Russia collaboration

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