Download 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.
3
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 submillimeterwavelength 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.
5
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
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 the Dubna group is study of DrellYan 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
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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1015 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
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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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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
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JINR preparations for science with ALICE
TRD
Electron ID
MUON
m+m- pairs
PHOS
g, 0
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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/,  families) production.
Quarkonium suppression (Di-muon decay mode; Di-electron
decay mode)
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 107 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.
20
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
Development of New Cluster
Finding Algorithm
The Study of the HBT Correlations
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 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 the Upsilon in p-Pb and Pb-p collisions
in the ALICE muon spectrometer ( pt m > 3GeV/c)
bb̃ BGR & Signal
p-Pb
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Search for the HIGGS; Origin of Mass; Super Symmetry
The ATLAS Detector at the CERN LHC
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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 H → 4μ
(G.Chelkov, I.Boiko, K.Nikolaev, R.Sadikov)
Study of the the ATLAS large-mass Higgs discovery potential by means
of the reactions H→2W→2l, or H→2W→l jj (Yu.Kulchitsky) and
H→2Z→2l , or H→2Z→lljj (V.Vinogradov). 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 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.)

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 "gamma/Z+jet" events) is being studied
by 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).
28
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.
29
These are ongoing theoretical studies that still need to be simulated in ATLAS.
JINR Physics at the Tevatron
D0
(Alexeev +10)
 QCD: development of a method for direct jet energy scale calibration (JES)
 Direct photons (Pt spectrum)
 Structure function measurment in new kinematic region
 B physics: - development of methods for efficient low pT tracking (needed for
 detecting soft final state pions and protons)
 Search for Xi_b cascade hyperon in exclusive decay channel
Xi_b  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
30
Experimental programs for discussion at a future meeting:
Mature Efforts
NA48
H1
HERAB
STAR
PHENIX
COMPASS
DIRAC
HARP
NA45
NA49
HADES
CBM
WASA
NIS
Underway
CBM
PANDA
TUS
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
32
Backup Slides
33
SM dimuon continuum calculations at present
Uncertainties are coming
from

QCD and EW
corrections (up to 6 %
for 3 TeV)

Parton Density Functions
Internal PDF uncertainties
are dominant for the large
invariant range!
~ 6 % for 1 TeV masses
~ 12 % for 3 TeV masses
The PDF needs to be measured more precisely in the large x and Q2 region
34
Configuration of AliEn sites in Russia
04Q2 – >4 AliEn operators at work stations
SPbSU
JINR
INR
PNPI
KIAE
CERN
IHEP
server
ITEP
35
36
37
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
(~106 RF pulses) required for the third study stage of the project.
2. Discussion of the experimental results and future plans.
38