1 Report of PAC for Particle Physics T. Hallman JINR Scientific Council Meeting January 19-20, 2006 Dubna, Russia

2 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 |V td |) 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).

3 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)

4 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

5 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

6 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;

7

8 HE SE JINR bears Full Responsibility ME1/1 JINR Participate JINR bears Full Responsibility HE SE ME1/1 JINR Participate HE SE JINR bears Full Responsibility JINR bears Full Responsibility ME1/1 JINR Participate JINR Participates JINR in the CMS Physics Program Search for the HIGGS; Origin of Mass; Super Symmetry

9 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)

10 The ATLAS Detector at the CERN LHC Search for the HIGGS; Origin of Mass; Super Symmetry

11 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 M HIGGS = GeV. Preparing to do science with ATLAS

12 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.

13 JINR Preparations for science with ALICE TRD Electron ID TRD Electron ID PHOS g,  0 PHOS g,  0 MUON m + m - pairs MUON m + m - pairs

14 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.

15 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

16 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: ± 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 p T (K+K-) < 0.6 GeV/c to 6.2% at the highest pt > 2.2 GeV/c with the significance equal to 120. Physics With ALICE

17 Detection of Upsilons in p-Pb and Pb-p collisions in ALICE muon spectrometer ( p t  > 3GeV/c) bb̃ BGR & Signal p-Pb

18 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.

19 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 CPU(kSI2000) Disk Space(TB) Tape(TB) 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.

20 Tier1/2 Network Topology LIT support of LHC experiments on CCIC: ALICE - the software developed by collaboration: AliEn2 - Data Challenge; own versions of ROOT; AliRoot, Geant3, FLUKA - analysis and processing CMS - the software at LCG-2: VO-cms-CMKIN VO-cms-OSCAR VO-cms-ORCA ATLAS - the software: ATHENA (release and higher), ROOT 4.04/02; TDAQ Monitoring and Control sub-systems; farm management

21  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