Report of PAC for Particle Physics

Report
Report of PAC for Particle Physics
T. Hallman
JINR Scientific Council Meeting
June 2-4, 2005
Dubna, Russia
1
Recommendations on New Projects
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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
2
Recommendations on Current Experiments
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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.
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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.
3
Recommendations on Current Experiments
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The PAC recommends continuation of the following activities:
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NA49
PHENIX
PICASO
BECQUEREL
ALICE
ATLAS
CMS
STAR
CDF
D0
COMPASS
HADES
Thermalization
4
Recommendations on Closing Experiments
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The PAC recommends closure of the following activities:
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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
5
JINR Particle Physics
road map
Draft
The role of the Road Map is to:
 ensure scientific excellence of JINR
 maximise the scientific output within the resources
 support and develop existing facilities and infrastructure
6
Worldwide Priorities in particle
physics
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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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Search for the HIGGS; Origin of Mass; Super Symmetry
JINR bears
Full Responsibility
JINR
Participate
Participates
ME1/1
SE
HE
JINR in the CMS Physics Program
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JINR in CMS Physics
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
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Many theoretical predictions suggest possible violation of the SM
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Unique opportunity to test the SM up to 3-5 TeV mass region (Tevatron
region is limited only of 0.8 TeV)
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Studt facilitated by excellent performance of CMS Muon system
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Possibility of strong theoretical support of this research program st
JINR
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JINR plans for physics with CMS
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:
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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)
11
Search for the HIGGS; Origin of Mass; Super Symmetry
The ATLAS Detector at the CERN LHC
12
Preparing to do science with ATLAS
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.
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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.)
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Using the full simulation of
ATLAS detector
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Study effects of pile-up (first
time in ATLAS!)
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Background study.
Preprint JINR (Р1-2004-44)
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JINR Preparations for science with ALICE
TRD
Electron ID
MUON
m+m- pairs
PHOS
g, p0
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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:
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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:
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Particle identification with Inner
Tracking System and Time
Projection Chamber
480 HIJING events
Simulation of Φ  K+K- including
the tracking and detector (ITS,TPC)
efficiencies
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Development of New Cluster
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Finding Algorithm
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The Study of the HBT Correlations
480 HIJING events
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Physics With ALICE
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% at
the highest pt > 2.2 GeV/c with the significance (S / S + B ) equal to 120.
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Detection of Upsilons in p-Pb and Pb-p collisions in
ALICE muon spectrometer ( pt m > 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 MB
100-200 events will recorded in 1 sec
~ 21015 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
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JINR Central Complex for Information and Computing
6 – Interactive
18 – Common PC-farm
30 – LHC
MYRINET
cluster
COMMON
PC-farm
14 – MYRINET (Parallel)
20 – LCG
20 – File servers
8 – LCG-user interface
Year
INTERACTI
VE PC-farm
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
45
1000
1000
1000
WAN, MBit/s
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Conclusions
 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
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