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Report of PAC for Particle Physics

T. Hallman

JINR Scientific Council MeetingJune 2-4, 2005Dubna, Russia

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Recommendations on New Projects

The PAC recommends approval of the project “Astrophysical Studies in the NUCLEON space experiment” for execution until the end of 2008.

The PAC recommends approval of the opening of the new theme “Study of e+e- interactions, linear collider physics and detector” for execution until 2008.

The PAC looks forward to receiving additional information on the main research directions for the FAIR project (e.g. PAX) at a future meeting

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Recommendations on Current Experiments

The PAC appreciates the ongoing and planned studies at the LHC, RHIC, and the Tevatron, and looks forward to their realization with active participation from JINR physicists.

The PAC looks forward to a report at its next meeting to a report concerning the software and computing activities being actively carried out to allow JINR scientists to produce first scientific results at the time of LHC start-up

The PAC recommends BLTP theoreticians to be more actively involved in the preparations of the research programmes planned at the LHC.

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Recommendations on Current Experiments

The PAC recommends continuation of the following activities: NA49 PHENIX PICASO BECQUEREL ALICE ATLAS CMS STAR CDF D0 COMPASS HADES Thermalization

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Recommendations on Closing Experiments

The PAC recommends closure of the following activities: DEKPHI HARP/PS214 HYPERON-M HERA-B GAMMA-2 CERES/NA45 EXCHARM-II DISK WASA BES KAPPA SINGLET Energy Plus Transmutation Theoretical and Experimental investigation of electronuclear method of energy production

and radioactive waste transmutation

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JINR Particle Physics road map

ensure scientific excellence of JINR

maximise 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-Yanprocesses in the large invariant mass region

The idea is to test Standard Model calculations for muon pairsProduction 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)

Studt 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-Yanprocesses in the large invariant mass region

The idea is to test Standard Model calculations for muon pairsProduction 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)

Studt facilitated by excellent performance of CMS Muon system

Possibility of strong theoretical support of this research program st JINR

JINR in CMS Physics

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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)

These groups already exist, most physicists are below 35

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)

These groups already exist, most physicists are below 35

Permanent weekly seminar in LPP, Wednesday, 15:00 (in plan monthly meeting with other RDMS physicists)Permanent weekly seminar in LPP, Wednesday, 15:00 (in plan monthly meeting with other RDMS physicists)

JINR plans for physics with CMS

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The ATLAS Detector at the CERN LHC

Search for the HIGGS; Origin of Mass; Super Symmetry

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Physical process simulations and new research proposals of the ATLAS-JINR group were discussed at the both Workshops on the ATLAS physical program(Dubna (April and November, 2004). The main 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 (first time in ATLAS!)

Background study.

Preprint JINR (Р1-2004-44)

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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 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

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 respectrively: 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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CMS Computing at JINR

Unprecedented LHC Research program can not be carried out with conventional even most advanced computing facilities

1 CMS event = 1 MB100-200 events will recorded in 1 sec ~ 21015 B/year (2 PetaB/year)

To support LHC Research programme the generation of computing network organization based on GRID concept is under development (LCG project)

Unprecedented LHC Research program can not be carried out with conventional even most advanced computing facilities

1 CMS event = 1 MB100-200 events will recorded in 1 sec ~ 21015 B/year (2 PetaB/year)

To support LHC Research programme the generation of computing network organization based on GRID concept is under development (LCG project)

In JINR this activity has been started on the basis of LIT since almost the very beginning of the CMS project

JINR is on of the founder of RDMS LHC Regional Computer Center

At present JINR computer facilities is very well integrated in the LCG project

In JINR this activity has been started on the basis of LIT since almost the very beginning of the CMS project

JINR is on of the founder of RDMS LHC Regional Computer Center

At present JINR computer facilities is very well integrated in the LCG project

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6 – Interactive

18 – Common PC-farm

30 – LHC

14 – MYRINET (Parallel)

20 – LCG

20 – File servers

8 – LCG-user interface

MYRINETcluster

COMMONPC-farm

INTERACTIVE PC-farm

Year Present time

2004 2005 2006 2007

CPU 116 130 180 250 400

Disk Space, TB 14 18 50 100 500

Tape, TB 2.5 (10 ?) 2.5 (10 ?) 50 50 150

WAN, MBit/s 45 1000 1000 1000

JINR Central Complex for Information and Computing

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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

The exercise commissioned by the Directorate at the suggestion of the Scientific Council to review the scientific priorities of

the projects within the context of a realistic budget is continuing

Conclusions