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JINR in CMS Physics Program. I.A. Golutvin 97 th Session of the JINR Scientific Council, January 21, 2005. 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.

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slide1

JINR in CMS Physics Program

I.A. Golutvin

97th Session of the JINR Scientific Council, January 21, 2005

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide2

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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide3

RDMS Participation in CMS Construction

RDMS bears

Full Responsibility

RDMS

Participates

ME1/1

ME

SE

EE

HE

HF

FS

The main obligations of RDMS are focused at endcaps 1.3    5.5, i.e.

covers the most kinematics range of CMS

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide4

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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide5

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 (< 2000 ton each)

to the shaft (~80 m under ground)

Summer 2007: physics starts

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide6

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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide7

Endcap Muon System,ME

ME2/1 Installation at SX5

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide8

LHC Physics Perspectives

The LHC physics perspectives are unprecedented: conditions of early Universe starting 10-21 sec after Big Bang (T=1022 K) will be recreated !

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide9

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 !

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide10

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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide11

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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide12

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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide13

CMS CPT Organization

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide14

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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide15

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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide16

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.

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide17

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/ +- K+K-) – JINR + Belarus
      • Higgs (ZZ  ll) – Ukraine
      • QCD (jet physics, diffraction) – JINR + Armenia + Belarus
      • Heavy Ions – JINR + Georgia

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide18

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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

research strategy
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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

research strategy1
Research Strategy

This strategy includes the following main research direction:

  • Theoretical support
    • calculations of SM dimuon continuum
      • QCD and EW high-order corrections
      • PDF’s 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
    • Farm and network supporting (hardware and core software)
    • Scenario of data processing and analysis

We want to examine SM with the best

reachable accuracy !

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

theoretical uncertainties for drell yan dimuon continuum
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

InternalPDF 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 !!!

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide22

CMS high-pT muon performance

  • High-energy muon features:
  • Huge bremsstrahlung and EM showering

large secondaries (muon looks like an

electron)

  • Small multiple scattering

TeV muon in CMS muon stations

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!

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide23

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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide24

Expected Uncertainties

Theoretical uncertainties

  • QCD corrections
  • EW corrections
  • PDF’s

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 !

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

research strategy2
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 !!!

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

new physics
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 eхplain 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 …

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

new physics1
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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

tev scale gravity large extra flat dimensions add
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 3+6=9)

  • 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 !

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

tev scale gravity one curve extra dimension rs1

Minv, GeV

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)+time !

  • 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

Brane-our 4-D world

GN

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

models with extended gauge sector
Models with extended gauge sector
  • Extended gauge models assume wider symmetry groups than SM one (70’s-90’s)
  • 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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide31

Tevatron and LEP Limitations

ADD

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)

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

cms discovery limits

ADD-scenario

(n flat extra

dimensions)

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)

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

angular distributions models distinguishing

GKK

Events

Z

cos*

Angular distributions: Models distinguishing

Angular distributions  Different spin structure !

~ 100 fb-1of

LHC operation

M = 1.5 TeV

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

cms computing
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)

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide35

Lab m

Uni x

CERN Tier1

Uni a

UK

JINR

and

Russia

France

Tier3

physics

department

Uni n

CERN

Tier2

USA

Lab b

Germany

Italy

Lab c

Uni y

Uni b

regional group

LHC Computing Modelevolving

LHC Computing Structure

The opportunity of

Grid technology

Tier1

Desktop

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

cms computing at jinr
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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide37

RDMSDistributed Computing Facilities

LCG Tier1/Tier2

cloud

TheData Grid cloud

GRID access

2003: 50 Mbit/s

2004: 100-155 Mbit/s

2007: 1-2 Gbit/s

Tier-2’s

Cluster

FZK

CERN

JINR

IHEP

Kharkov

Gbits/s

RRC KI

Minsk

Tier2

cluster

RRC-LHC

SINP MSU

Regional connectivity:

cloud backbone – Gbit’s/s

to labs – 100–1000 Mbit/s

PNPI

INR RAS

ITEP

Collaborative

centers

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide38

JINR Network Communications

Provision of JINR and JINR Member States with high-speed

communication links

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide39

“digi”

RAW

Data

1 MB/ev

Simulation

Data Base

Condition

Data Base

~ 10 TB

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

(user’s 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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

slide40

MYRINET

cluster

COMMON

PC-farm

LHC

INTERACTIVE PC-farm

LCG

JINR Central Complex for Information andComputing (LIT)

6 – Interactive

18 – Common PC-farm

30 – LHC

14 – MYRINET (Parallel)

20 – LCG

20 – File servers

8 – LCG-user interface

Other possibility is SKIF K-1000(~ 576 processors) - ?

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

jinr dimuon team
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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

jinr cms meetings
JINR CMS Meetings

Regular JINR CMS meetings:

  • Weekly seminar in LPP, Wednesday, 15:00
  • 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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

summary
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 …

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

summary1
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 facilitiesis 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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

summary2
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

I.A. Golutvin, "JINR in CMS Physics Program", 97th Session of the JINR Scientific Council, January 21, 2005

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