Transcript Report of PAC for Particle Physics
Report of PAC for Particle Physics
T. Hallman JINR Scientific Council Meeting January 20-21, 2005 Dubna, Russia 1
Outline of this Talk
Recent decisions taken at the November meeting
Planned exercise to set scientific priorities for the projects Information on physics topics that will be investigated in external experiments 2
Recommendations on New Projects
The PAC recommends approval of the project “Lifetime of
+
and
± k
atoms to test low energy QCD” (an addendum to the DIRAC project) for execution with first priority until 2005. This addendum can be approved for a longer time in the future provided the DIRAC studies of lifetime of
+
atoms are fully completed in 2005.
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Recommendations on New Projects
The PAC recommends approval of the project “Search and study of eta-mesonic nuclei in pA-reactions at the Nuclotron” for execution until the end of 2007, with first priority until 2005.
The PAC recommends approval of the opening of the new theme “Mathematical support of experimental and theoretical studies conducted by JINR” for execution until 2007 with first priority in 2005.
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Recommendations on Current Experiments
The PAC strongly recommends to make the Movable Polarized Target (PPM) available to the experiments as soon as possible and requests the Directorate ensure that adequate resources are available for the realization of this project.
The PAC notes the physics results obtained in NA49 and recommends continuation of JINR’s participation in this activity.
The PAC note the physics results obtained on the PHENIX project and recommends continuation of JINR’s participation in this activity.
The PAC notes the successful R&D carried out with CLIC, as well as the creation of a millimeter test range facility; the start of experimental data taking as well as R&D for a submillimeter wavelength range. Taking into account the importance of this work…the PAC recommends approval of this project up to 2007 with first priority in 2005.
The PAC takes note of the status report on the TUS project (JINR’s participation) and on the development of a proposal for the NUCLEON project. The PAC recommends continuation of JINR’s participation in the TUS project with first priority until the end of 2005. The authors are invited to present a proposal for NUCLEON ar the next meeting of the PAC.
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Setting Scientific Priorities Within the Program "The Scientific Council would like the PACs to set scientific priorities, in light of budgets requested for the projects, being informed by the Directorate of the global financial situation, and the resources they propose to distribute to different fields of research…” 6
Setting Scientific Priorities Within the Program An internal committee, Chaired by Prof. Igor Savin, will be commissioned to review the projects and recommend changes. The recommendation of the internal committee will be provided to the PAC at the November meeting. In addition the PAC, in response to the following charge from Vice-Director Sissakian will provide helpful guidance at the beginning of this process by providing input concerning the scientific priorities of the projects. 7
Setting Scientific Priorities Within the Program Dear Professor Hallman: In accordance with the recommendation of the Scientific Council at its meeting of 3-4 June, 2004, I am asking that the Program Advisory Committee for Particle Physics provide guidance on the scientific priorities for approved projects in the JINR particle physics program. The primary purpose of this exercise is to seek input from the PAC on the significance, quality, and promise of ongoing and planned research in the context of maintaining a world-class particle physics research program at JINR. In carrying out this charge, the PAC is requested to comment on each project concerning whether it is: First Priority: absolutely essential, compelling research that "must be done" to support world leadership by JINR in particle and nuclear physics Second Budgetary Priority: excellent, forefront research by JINR scientists which should be supported with high priority Second Non-Budgetary Priority: important scientific research which should be carried out if resources permit 8
Setting Scientific Priorities Within the Program In making this determination, the PAC should evaluate the following: 1) Scientific significance of the research project in a world view 2) Strength of the JINR scientific contribution to the project 3) Demonstrated achievement and future promise of JINR scientific team on the project; strength of the team involved in the project (experience, reputation) 4) Extent to which the project contributes to the scientific life of JINR in Dubna The comments of the PAC will constitute essential input for the effort at JINR to shape a world-class research programme which is fits within the constraint of available resources. I greatly appreciate the willingness of the PAC to assist the Directorate in making this important determination. I look forward to an informative report. Sincerely, A. Sissakian 9
Search for the HIGGS; Origin of Mass; Super Symmetry
JINR bears Full Responsibility JINR Participate ME1/1 SE HE
JINR
in the CMS Physics Program
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JINR in CMS Physics
The field of special interest of the Dubna group is study of Drell Yan processes in the large invariant mass region The idea is to test Standard Model calculations for muon pair production up to the highest invariant mass accessible This task is attractive because: There are many theoretical predictions of violations of the SM There is no competition for the LHC unique opportunity to test the SM up to 3-5 TeV mass region (Tevatron region is limited only of 0.8 TeV) Excellent performance of CMS Muon system Potential of the Dubna theoretical school to support this research program This activity of the JINR group is very visible in CMS ~ 20 contributions on these issues at CMS week and other conferences in 2004 alone.
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Research Strategy
The strategy of this investigation is model-independent precision measurement of di-muon spectra and comparison of the data with theoretical calculations within the Standard Model.
This strategy includes the following main research directions: Theoretical support calculations of SM di-muon continuum QCD and EW high-order corrections PDF’s uncertainties: status and perspectives modern tends in physics beyond the SM (conceptions, models, event generators) Experimental studies of di-muons Development of reconstruction and analysis software a few % momentum resolution of TeV muon and dimuon pairs high track (and dimuon) reconstruction efficiency Data pre-processing and analysis Calibration and analysis Trigger Beam and cosmic tests Computing Farm and network supporting (hardware and core software) Scenario of data processing and analysis 12
JINR in CMS Physics
JINR physicists are very well integrated in the CMS CPT (computing / physics / triggering) project They take part in Calibration Development of core and reconstruction software Development of data processing and analysis scenarios In particular, JINR physicists are involved in the tasks related to: B-physics QCD (jet physics) Heavy Ion (QGP) physics 13
CMS Computing at JINR
The unprecedented LHC research program can not be carried out with even the most advanced conventional computing facilities 1 CMS event = 1 MB 100-200 events will recorded in 1 sec ~ 2 10 15 B/year (2 PetaB/year) To support the LHC research programme next generation computing network organization based on the GRID concept is under development (LCG project) In JINR, this activity was started by LIT since the very beginning of the CMS project JINR is on of the founder of RDMS LHC Regional Computer Center At present, JINR computer facilities are well integrated into the LCG project 14
JINR Central Complex for Information and Computing
6 – Interactive 18 – Common PC-farm 30 – LHC 14 – MYRINET (Parallel) COMMON PC-farm 20 – LCG 20 – File servers 8 – LCG-user interface INTERACTI VE PC-farm MYRINET cluster Year CPU Disk Space, TB Tape, TB WAN, MBit/s Present time 116 14 2.5 (10 ?) 2004 130 18 2.5 (10 ?) 45 2005 2006 180 50 50 250 100 50 1000 1000 2007 400 500 150 1000
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JINR plans for physics with CMS
At the stage of data taking and physics analysis, the JINR CMS project will be organized as a joint effort between several groups from LPP, LHE, LPP and LIT with tasks distributed along the following lines: 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, each Wednesday at 15:00 Planned monthly meeting with other RDMS physicists Annual RDMS Conferences: VII – December 2002 in IHEP, Protvino VIII – December 2003 in JINR, Dubna IX – December 2004 in NCHEPP, Minsk X – December 2005 in PNPI, St.-Petersburg 16
JINR preparations for science with ALICE
TRD Electron ID PHOS g , 0 MUON m + m pairs 17
Planned JINR Scientific Analyses on ALICE
1.
Study of hot and dense nuclear matter in 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/ decay mode)
,
families) production. Quarkonium suppression (Di-muon decay mode; Di-electron Direct photon production; ‘Prompt’ photon characteristics and two-photon correlations
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Planned JINR Scientific Analyses on ALICE
Study of proton - nucleus (pA) and proton – proton (pp) collisions.
pA and pp measurements as a benchmark for heavy ion physics
Light resonance production and particle correlations Di-muon decay mode Di-electron decay mode Charged particle multiplicity distributions; very high multiplicity.
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LHC Computing
JINR team has taken responsibility to organize the Physics Data Challenge for all ALICE Institutes situated in Russia
Physics Data Challenge: March - August 2004 10 7 events processed LHC Computing GRID (LCG) activity (deployment, test) Processed jobs by JINR ~ 2500 Erroneous jobs on JINR site ~ 404 Possible explanation – the RAM capacity of 2 processors batch node (512MB) was insufficient for processing of two AliRoot jobs.
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Physics Simulation in ALICE -- Particle Identification:
Particle identification with Inner Tracking System and Time Projection Chamber
Simulation of efficiencies Φ
K + K including the tracking and detector (ITS,TPC)
Development of New Cluster Finding Algorithm
The Study of the HBT Correlations 480 HIJING events 480 HIJING events
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Physics With ALICE
Effective mass distribution of (K+K-) pairs.
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 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.
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Detection of the Upsilon in p-Pb and Pb-p collisions in the ALICE muon spectrometer ( p t
m
> 3GeV/c)
bb
BGR & Signal
p-Pb
23
Search for the HIGGS; Origin of Mass; Super Symmetry The ATLAS Detector at the CERN LHC 24
Scientific authors from JINR/Dubna (2005) Alexandrov I.,Bardin D., Bednjakov V., Boyko I., Budagov J., Chelkov G., Evtukhovich P., Flyagin V., Glonti G., Gostkin M., Grigalashvili N., Kalinovskaja I., Kazarinov M., Kekelidze G., Khovansky N., Kotov S., Kotov V., Krumstein Z., Kukhtin V., Ladygin E., Lazarev A., Manjavidze I., Minashvili I., Mineev M., Nanava G., Neganov A., Olshevski A., Peshekhonov V., Pisarev I., Romanov V., Rusakovich N., Rybaltchenko K., Sissakian A., Tchepournov V., Topilin N., Usov Y., Vinogradov V.
+ graduated students: Arabidze G., Barashkou A., Dedovich D., Demichev M., Elagin A., Guskov A., Nikolaev K., Kruchonak V., Ilushenko E., Khartchenko D., Khoriauli G., Khramov E., Kolesnikov B., Kruchonak V., Potrap I., Rumjantsev L., Sadykov R., Tonojan A., Zhemchugov A.
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Preparing to do science with ATLAS
Physics simulations and new research proposals of the ATLAS-JINR group were discussed at the two workshops on the ATLAS physics 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 (G.Chelkov, I.Boiko, K.Nikolaev, R.Sadikov) H → 4μ Study of the the ATLAS large-mass Higgs discovery potential by means of the reactions H→2Z→2l , or H→2W→2l H→2Z→lljj , or H→2W→l jj (Yu.Kulchitsky) (V.Vinogradov). and These studies were based on simulated ATLAS DC1 and DC2 data. They rely on the Higgs boson production via the Vector Boson Fusion mechanism (the two accompanying forward jets allow very good background reduction) and on the maximal Higgs boson decay rates into WW- or ZZ-pair at M HIGGS = 400 -- 1000 GeV. 26
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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Preparing to do science with ATLAS
The possibility of investigating the quark-gluon structure functions with the ATLAS detector by means of simultaneous registration of a direct photon (or Z-boson) and jets (so called by " gamma/Z+jet" events) is being studied D.Bandurin and N.Skatchkov. An HEP (semi-)analytical calculation tool for the LHC (Project SANC: Support of Analytical and Numerical Calculations for Experiments at Colliders) is being Developed by: D.Bardin, L.Kalinovskaya, P.Christova, G.Nanava A.Andonov (DLNP, JINR), A.Arbuzov, S.Bondarenko (BLTF, JINR)and V.Kolesnikov (PhD student, UNC, JINR).
This a work in progress which promises to be useful for development of the JINR-ATLAS physical program in the near future. Physical verification of the SM electric charge of the top-quark (+2/3) with the ATLAS detector utilizing lepton-jet top decay channels (N.Russakovich, V.Bednyakov ,E.Khromov, A.Tonoyan).
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Preparing to do science with ATLAS
Evaluation of the next-to-leading order QCD corrections to single top- and top-anti top quark production together with an estimation of the associated top-Higgs production (in pp-interactions) are being studied by A.Akhmedov. Aspects of research on top- and Higgs boson production and the search for the exotic phenomena at the LHC are being explored by Z.Usubov. Theory and phenomenology of ATLAS physics with the Higgs bosons, extra gauge bosons and (very) heavy quarkonia states as well as a the theory of the multi-particle correlations during particle production is being studied by G.Kozlov. A possible monopole search with the ATLAS detector is being explored by Yu.Kurochkin (Minsk). Diffractive Higgs production and the search for the virtual electroweak effects with ATLAS are being studied by I.Satsunkevich (Minsk).
V.Gilevsky (Minsk) is studying general parameterization of 4-boson vertex and its importance for collider physics. P.Starovoitov (Minsk) is examining the two-photon mechanism of Drell-Yan lepton pair production in pp-collisions and has demonstrated that its contribution is not negligible.
JINR Physics at the Tevatron
D0 (Alexeev +10)
QCD: development of a method for direct jet energy scale calibration (JES) Direct photons (P t spectrum) Structure function measurment in new kinematic region
B physics: - development of methods for efficient low p T detecting soft final state pions and protons) tracking (needed for
Search for Xi_b
Xi_b cascade hyperon in exclusive decay channel J/psi + Xi.
Software tools development and some analysis is done in Dubna; the main analysis at FNAL CDF
(Budagov +12) JINR CDF groups are heavily involved in the measurement of top quark mass in lepton-lepton and lepton-jet channels Data analysis is performed equally at Fermilab and Dubna
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Experimental programs for discussion at a future meeting: Mature Efforts NA48 H1 HADES CBM HERAB WASA STAR NIS PHENIX COMPASS DIRAC CBM PANDA HARP TUS NA45 NA49 Underway Future Prospects 31
Conclusions
Aggressive 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
An important exercise has now been commissioned by Vice-Director Sissakian at the suggestion of the Scientific Council to have the PAC For Particle Physics comment on the scientific priorities of the projects within the context of a realistic budget
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Backup Slides
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SM dimuon continuum calculations at present
Uncertainties are coming from QCD and EW corrections (up to 6 % for 3 TeV) P arton D ensity F unctions Internal PDF uncertainties are dominant for the large invariant range!
~ 6 % ~ 12 % for 1 TeV masses for 3 TeV masses The PDF needs to be measured more precisely in the large
x
and Q 2
Configuration of AliEn sites in Russia
04Q2
– >4 AliEn operators at work stations
SPbSU JINR PNPI INR IHEP CERN
server
KIAE ITEP 35
36
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JINR-IAP FEM OSCILLATOR
CLIC: Test facility for the investigation of heating RF-damage effect in linear colliders
Results of 2002 1. The 30 GHz FEM demonstrated the required characteristics (RF power and pulse length, operational stability, RF parameters deviations and repetition rate) 2. The RF test equipment was installed in a test area.
3. The overall test stand (FEM and RF test equipment) was assembled and tuned 4. First RF pulsed heating experiments started in order to successfully move to the second study stage of the project.
Program for 2003 1. Scheduled routine tests to achieve the required integrated statistical level (~10 6 RF pulses) required for the third study stage of the project.
2. Discussion of the experimental results and future plans.
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