JINR in CMS Physics Program

1
JINR in CMS Physics Program
I.A. Golutvin 97th Session of the JINR
Scientific Council, January 21, 2005
2
RDMS Participation in CMS Project
Since more than 10 years JINR as a member of
Russia and Dubna Member State (RDMS)
collaboration has participated in CMS
3
RDMS Participation in CMS Construction
The main obligations of RDMS are focused at
endcaps 1.3 ? ? ? 5.5, i.e. covers the most
kinematics range of CMS
4
RDMS Contribution to CMS
Total RDMS contribution in CMS is 21,373
MCHF Total JINR contribution in CMS is
13.257 MCHF from JINR budget 7.115
MCHF from special RF budget through JINR
6.142 MCHF
5
RDMS Participation in CMS
By the end of 2004 most of RDMS (JINR)
obligations are successfully fulfilled. Both
endcap HE and 76 ME1/1 chambers have been already
delivered to CERN. Assembly of apparatus and
commissioning of subsystems are in full
swing Fall 2005 full assembly and magnet
test of the whole
CMS Detector in the surface hall SX-5 Spring
2006 start of lowering by pieces (lt 2000 ton
each) to the shaft (80 m
under ground) Summer 2007 physics starts
6
Inner Endcap Integration/Installation
JINR is actively participating in CMS Assembly,
Installation and Commissioning in the surface
hall SX5 The main focus is Inner Endcap the
most difficult part of CMS Integration
7
Endcap Muon System, ME
ME2/1 Installation at SX5
8
LHC Physics Perspectives
The LHC physics perspectives are unprecedented
conditions of early Universe starting 10-21 sec
after Big Bang (T1022 K) will be recreated !
9
LHC Physics Perspectives

• The goal of LHC Program is to attack well-known
  open
• questions in Physics
• Mass why do fundamental particles have masses
  and why these
• masses are such different?
• Antimatter why at the present days matter
  dominates antimatter?
• Dark matter where is concentrated the hidden
  mass of Universe?
• World geometry are there extra dimensions? bulk
  volume geometry?
• New particles do they exist? (sparticles, extra
  gauge bosons, graviton states etc)
• QCD matter what are the properties of QCD at
  extreme high densities, does QGP exist?
• Standard model validity bounds ? high precision
  tests of SM !

10
Towards to Physics
Since more than 10 years many physicists and
engineers have extended much labor on the
construction of the CMS Detector As a result of
this effort the CMS Detector will be ready in
time The CMS pilot run is already in 2007
11
Towards to Physics
Now the CMS physics program is the first priority
task for RDMS
In line with huge amount of work on the CMS
assembly and installation JINR physicists
participate in development of Physics Research
program with CMS detector We believe RDMS
physicists will get a similar position in CMS
Research Program as in the Detector Construction
12
Towards to Physics
It goes without saying JINR physicists as well
as the whole RDMS group should be integrated in
CMS where physics program is now organized as a
special CPT project Computing, Physics,
Triggering
13
CMS CPT Organization

Physics of Standard Model
Higgs Physics
SUSY/Beyond Standard Model
Heavy Ion



ECAL e/? HCAL JetMet Muon Tracker B/tau
Reconstruction project
Simulation project
Analysis project
14
RDMS Participation in CPT
Again RDMS strategy is the same as it was during
the CMS construction
Being well integrated in the CMS CPT (computing/
physics/triggering) project RDMS will concentrate
efforts at only few topics
15
RDMS Task Force

• RDMS Physics Task Force (RDMS physics project)
  was set up several years ago to focus main
  efforts of RDMS physicists at only a few physics
  tasks, mainly
• Dimuon with large masses
• WW fusion
• Top quark physics
• Dimuon resonance states in Heavy Ion
• The goal is full study of these selected channels
  starting from theoretical aspects and simulation
  up to the final physics results

16
RDMS Task Force
This activity is very well visible in CMS
collaboration Visibility of individual groups
in a huge collaboration is the only way to make
CMS attractive for young talented physicists.
Otherwise they will go to other fields.
17
JINR in CMS Physics

• Indeed JINR and Member States physicists are very
  well integrated
• in CMS CPT (computing/physics/triggering) project
  
• They play an important role in
• Calibration
• Development of core and reconstruction software
• Development of data processing and analysis
  scenarios
• In particular, JINR and Member States physicists
  are involved in the
• several tasks
• B-physics (Bs?J/? ????- KK-) JINR Belarus
  
• Higgs (?ZZ ? ll?? ) Ukraine
• QCD (jet physics, diffraction) JINR
  Armenia Belarus
• Heavy Ions
  JINR Georgia

18
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

• We select this task because of following reasons
• There are many theoretical prediction to
  violation of SM
• There is no competitors to 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 Dubna theoretical school to support
  this research program
• This activity of JINR group is very well visible
  in CMS more than
• 20 contributions on these issues at CMS weeks and
  
• conferences only in 2004

19
Research Strategy
The strategy of this investigation is model
independent precise measurements of dimuon
spectra and comparison of obtained data with
theoretical calculations within the Standard
Model
20
Research Strategy

• This strategy includes the following main
  research direction
• Theoretical support
• calculations of SM dimuon continuum
• QCD and EW high-order corrections
• PDFs uncertainties status and perspectives
• modern trends in physics beyond the SM
  (conceptions, models, event
• generators)
• Experimental studies of dimuons
• 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

We want to examine SM with the best reachable
accuracy !
21
Theoretical uncertainties for Drell-Yan dimuon
continuum
SM dimuon continuum calculations at now

• Uncertainties are coming from
• QCD and EW corrections (up to 6 for 3 TeV)
• Parton Density Functions

Internal PDF uncertainties are dominated for the
large invariant mass range!
6 for 1 TeV masses 12 for 3 TeV masses
We need to measure the PDF more precisely in the
large x and Q2 region !!!
22
CMS high-pT muon performance
TeV muon in CMS muon stations

• High-energy muon features
• Huge bremsstrahlung and EM showering ?
• large secondaries (muon looks like an
• electron)
• Small multiple scattering

The current pT resolution is 4 for 1 TeV muon
(in central pseudorapidity region ) The angle
resolution is better than 0.5
Algorithm improvements are coming on !
23
Statistical errors
Tevatron region
Mass limit at LHC 5 TeV (0.8 TeV for Tevatron)
L1
HLT
Physics of Standard Model
The DY rate in TeV mass region is very small
103 events/year (10-6 of stored events) If case
of new physics the rate can be increased by
factor of 10-100
Higgs Physics, SUSY
Physic beyond the SM
DY
Mass reach scale
24
Expected Uncertainties

• Theoretical uncertainties
• QCD corrections
• EW corrections
• PDFs

• Detector and algorithm inefficiencies
• Trigger and reconstruction inefficiencies
• Goodness of reconstruction algorithms
• Misalignment and quality of digitization,
• track reconstruction and track
• parameters calculation

For a moment the theoretical uncertainties (
4-12 ) dominate systematic detector errors (3-6
) ? need to be decreased
If new physics exists, requirements for dimuon
accuracy can be relaxed !
25
Research Strategy
This strategy allows to measure SM dimuon
continuum with a few percent accuracy
ANY DEVIATIONS ABOVE THE UNCERTAINTY BAND WILL
INDICATE ON NEW PHYSICS !!!
26
New PHYSICS ?

• Open questions in Standard
  Model
• Free parameters in Standard Model (too many - 25
  - constants) can not be fixed in the framework of
  SM
• Hierarchy problem (huge gap between Electroweak
  (102 GeV) and
• Planck (1019 GeV) scales)
• Gravity is not incorporated in SM
• SM does not e?plain cosmological problems
• (origin and early evolution of our
  Universe, up to t 10-(22?34) s)

SM is not an ultimate theory !
We need to go beyond it
27
New PHYSICS
There exist many possible extensions of the SM
and physical ideas beyond the SM (supersymmetry,
gauge sector, TeV-scale gravity, others) JINR
group made a thorough simulation of some

• Extended gauge sector
• TeV-scale gravity

28
TeV-scale gravity Large Extra Flat Dimensions
(ADD)

• N.Arkani-Hamed, S.Dimopoulos, G.Dvali, 1998
• The real World is multi-dimensional (2?6 flat
  -
• Euclidian - extra spatial dimensions, the
  maximal
• total number of dimensions is 369)
• New objects branes slices of
  multidimensional
• space (2D brane membrane, 3D brane etc
  up to
• maximal possible 9D brane)
• We (all of SM forces) live on 3D brane (there
  is
• another parallel hidden World)
• Only gravitons are multi-dimensional

A Parallel World
Our World
Graviton contributions to SM processes
MS- effective planckian scale
Excess above SM continuum !
29
TeV-scale gravity One Curve Extra Dimension (RS1)
RS1 scenario (only one LED)

• L.Randall, R.Sundrum, 1999
• two 3D brane Universe - our World and planckian
• one in a 5 dimensional curve
  (noneuclidian) space
• only one extra dimension 3(brane)1(extra)t
  ime !
• heavy (TeV ) graviton KK-excitations - spin-2
• resonance states

GPl
Brane apple
Another brane
R 1/k
Slice of bulk 5-D space
Z
c k/Mplank 0.01-0.1
Newton apple
GN
Brane-our 4-D world
30
Models with extended gauge sector

• Extended gauge models assume wider symmetry
  groups than SM one (70s-90s)

• new gauge bosons Z? and W? ? spin-1 resonance
  states
• a mass a few TeV
• the cross section and width are dependent on
  different model (Z?, Z?, Z?, ZLR etc)
• intensively couple into lepton pairs
• (muons and electron)
• the muon rate from Z exceeds the SM
• background by a factor of 100

31
Tevatron and LEP Limitations
The current lower mass limit for new resonances
is 0.5-0.6 TeV
Effective planckian scale lower limit (95
C.L.) is 1.3-2.5 TeV (Run II)
32
CMS Discovery Limits

• CMS will be able
• to cover a wide (or whole) range of model
  parameters
• to fix the energy limit of Standard Model
  validity

RS1-scenario
(two branes embedded in the curve bulk)
33
Angular distributions Models distinguishing
Angular distributions ? Different spin structure !
100 fb-1 of LHC operation
M 1.5 TeV
34
CMS Computing

• 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 program the new
  generation of Distributed Computing based on GRID
  technology is under development (LCG project)

35
LHC Computing Modelevolving
LHC Computing Structure
The opportunity of Grid technology
Tier1
Desktop
?
?
?
36
CMS Computing at JINR
At JINR this activity has been started on the
basis of LIT since almost the very beginning of
the CMS project JINR is one of the founders of
the RDMS LHC Regional Computing Center At
present LIT computing facility is very well
integrated in the LCG project
37
RDMS Distributed Computing Facilities
LCG Tier1/Tier2 cloud
The Data Grid cloud
GRID access
Tier-2s Cluster
2003 50 Mbit/s 2004 100-155 Mbit/s
2007 1-2 Gbit/s
FZK
CERN
JINR

IHEP
Kharkov
Gbits/s
RRC KI
Minsk
Tier2 cluster
RRC-LHC
SINP MSU
Regional connectivity cloud backbone
Gbits/s to labs 1001000 Mbit/s
PNPI
INR RAS
ITEP
Collaborative centers
38
JINR Network Communications
Provision of JINR and JINR Member States with
high-speed communication links
39
Scenario of RDMS Data processing and analysis
dimuons production for 100 fb-1 LHC operation
/Tier_1
Tier_0
Tier_0/Tier_1/Tier_2
?,?,e,j
GeV, cm..
ESD/DST 0.5 MB/ev
Analysis Object Data 0.1 MB/ev
Physics results
Selection compression Analysis
Calibration alignment processing
Objects Reco
ROOT Data (users files)
AOD TAG
ESD/DST sample
RAW Data sample
0.5 TB
0.41 TB
0.123TB

RDMS Tier_2
8.9 TB
Tier_0/Tier_1 Data Bases

40
JINR Central Complex for Information and
Computing (LIT)
6 Interactive 18 Common PC-farm 30 LHC 14
MYRINET (Parallel) 20 LCG 20 File
servers 8 LCG-user interface
Year 2004 2005 2006 2007
CPU 116 180 250 400
Disk Space, TB 14 50 100 500
WAN, MBit/s 45 1000 1000 1000
Other possibility is SKIF K-1000( 576
processors) - ?
41
JINR Dimuon Team

• 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, BLTP and
  LIT distributed through following task forces
• Data taking and technical support - LPP and
  LHE
• Input data control and processing -
  P.Moissenz LPP (4) LHE LIT
• Data processing and MC production - V.Korenkov
  LIT (5) LPP
• Physics analysis - S.Shmatov LPP (5) LHE
  LIT
• Theoretical support - D.Bardin, M.Savina,
  O.Teryaev BLTP N.Shumeiko Belarus
• These gropes already exist, most physicists are
  below 35 years old

42
JINR CMS Meetings

• Regular JINR CMS meetings
• Weekly seminar in LPP, Wednesday, 1500
• Annual RDMS CMS Conferences
• I-IV December, 1995-1999, CERN, Geneva
• V December, 2000, ITEP, Moscow
• VI December, 2001, MSU, Moscow
• VII December 2002, IHEP, Protvino
• VIII December 2003, JINR, Dubna
• IX December 2004, NCHEPP, Minsk
• X September 2005,PNPI, St.-Petersburg

• New
• Monthly meeting with other RDMS and CMS
  physicists

43
Summary
Rich CMS program covers the widest range of
physics issues Standard Model, Higgs, SUSY,
Exotic, TeV-scale gravity, Heavy Ions
There are open questions in Standard Model
SM is not an ultimate theory !
We need to go beyond it
44
Summary

• In additional to active participation in the CMS
  general Physics
• Project JINR group has decided to make a model
  independent test
• of Standard Model by measuring production of
  Drell-Yan pairs in the
• TeV region
• It is a very difficult research many JINR and
  Member States physicists have already combined
  efforts on this field
• Appropriate computer facilities is under
  development in Laboratory of Information
  Technologies
• We very much count on a valuable support of BLTP

We believe CMS will be able to improve
considerably the present bounds on the existence
of new objects in the TeV region or to discover
them if they exist in this scale
45
Summary
Thanks to JINR Directorate Acad. V.G.Kadyshevsky
and Prof. A.N.Sisakian for permanent support of
RDMS CMS project since the very beginning