the 34 th meeting of the cern-russia committee participation of russian institutions in the lhc...

The 34th Meeting of the CERN-Russia Committee

Participation of Russian Institutions Participation of Russian Institutions

in the LHC Experimentsin the LHC Experiments

17 October 2011, Geneva Victor Savrin

RUSSIA

in

LHC

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Data taking Data analysis Preparation of publications Preparation for a new HI run this Fall Maintenance and operation of the detectors including participation in shifts Study of the performance of the detectors Further development of the physics analysis tools Event simulation and reconstruction for principal processes to be observed at LHC collisions including new physics Participation in the upgrade R&D

Current activities of the Russian groupsin the LHC experiments


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ATLASATLAS


RUSSIA

in

LHC

4 417 October 2011, Geneva Victor Savrin

Rediscoveries:

Production of D*± , D± and Ds±

in pp collisions at 7 GeV

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A candidate Z boson event in the dimuon decay with 20 reconstructed vertices. This event was recorded on September 14th and is typical for the 2011 environment with high pileup after the beta* was reduced to 1m (in the Technical Stop in Sept 2011). The vertices shown are reconstructed using tracks with pT greater than 0.4 GeV.


Rediscoveries:

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Standard Model Higgs boson is excluded on 95 % CL in the mass intervals: 146<m

H<232 GeV; 256<m

H<282 GeV and 296<m

H<466 GeV


Higgs boson search

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7

Russian groups in ATLAS upgrade R&D

• GasPixel Tracker/L1 track trigger for the ATLAS sLHC upgrade (MEPHI/NIKEF +…..)

• Fast MDT (IHEP/Michigan)

• LAr at high intensity (IHEP/BNPI/LPI/CERN/MPI/……)

• Augmented reality software (CERN , IHEP….)

Radiation hard scintillator (IHEP)

Software development


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GasPixel tracker/L1 trigger for the ATLAS

Inner Detector (MEPhI)

Technology: Micromegas with pixel readout

Pixel chip

Mesh

Gas volume

50 m

50 m

Electronsdrift to the

mesh

Amplification region

particle

Pixel sensitive planeSpace point and two angles are measured:In the pixel planeis an angle to the pixel plane

Particle track image.

Electrons from particle track in the gas volume

This improvement allows to realize vector tracking This improvement allows to realize vector tracking in one detector planein one detector plane

Major motivation is to improve pattern recognition power for the ATLAS inner detector and realize L1 ID track trigger

Proposal was accepted in Spt. 2010 as an R&D work by the ATLAS collaboration.


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MDT (IHEP)

Proposal for muon spectrometer upgrade: from “usual” ATLAS DT (30 mm diam) to shaped one. Shaping of drift field : reduction of drift time and significant reduction of signal duration

4 field shaping wires

Standard 20m+2x2

Excellent x(t)

Test tubes are constructed and tested


1010

Experiment to establish limitations on operations of the ATLAS end-cap calorimeters at sLHC luminosities

IHEP, JINR, BNPI, FIRAN

The main goal of the experiment is to study the performance of the ATLAS HEC, EMEC and FCAL liquid argon calorimeters as expected for the operation at the planned sLHC. The increase of luminosity by a factor of ten has serious consequences for the signal reconstruction, radiation hardness requirements and operations of the above mentioned calorimeters.


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The goal of the project is to reduce the risk of radiation damage to the personnel, working in the environment with high radiation levels (inside the ATLAS detector for example).

The main idea is to give some "robotic possibilities" to the personnel working inside radiation-dangerous places.

Augmented reality


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CMSCMS



RUSSIA

in

LHC

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Example: Jet Physics (Dijet k-factor)

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The measured ratio of inclusive to exclusive dijet events is compared with SM predictions.No evidence for a visible BFKL effects at 7 TeV.

Study of Jet structure and performance in many analysis,including Jet energy calibration with physics processes

FWD 10-014, QCD 10-014, Phys. Lett. B 699 (2011) 48-

67, AN-2011/214

INR, ITEP, PNPI

FWD 10-014, QCD 10-014, Phys. Lett. B 699 (2011) 48-

67, AN-2011/214

INR, ITEP, PNPI

EP/2011-053 MSU

EP/2011-053 MSU

QCD-10-29 ITEP, MSU

QCD-10-29 ITEP, MSU

IN-2011/010IN-2011/001

JINR

IN-2011/010IN-2011/001

JINR

FWD-10-014


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Example: Di-muons

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Combined limits (+- + e+e-) at 95% CL exceed the Tevatron reach

A Z’ with standard-model-like couplings excluded below 1940 GeV, the superstring-inspired Z’ below 1620 GeV

RS Kaluza–Klein gravitons below 1450 (1780) GeV for couplings of 0.05 (0.10)

EXO-11-019

EXO-11-019

EXO-10-013EWK-10-

007EXO-11-019

JINR

EXO-10-013EWK-10-

007EXO-11-019

JINR

EWK-10-007

EWK-10-007


All known resonances are re-discovered in DY

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Example: right handed WR and heavy Majorana neutrino

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EXO-11-002, CMS AN-2011/131

INR

EXO-11-002, CMS AN-2011/131

INR

The plan is to exceed Tevatrons limits by a factor of 5 with the CMS data 2011-2012

WR μμjj

WR ee jj 2010

2011

2011

2010 WR ee jj WR μμjj

No excess over expectations from SM is observed.

For models with exact left-right symmetry and 240 pb-1 excluded the region below of (MW , MN)=(1700 GeV, 600 GeV).


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Indications for formation of hot quark gluon matter in HI

A strong increase in the fraction of highly unbalanced jets is seen in central PbPb collisions compared with peripheral collisions and model calculations, that consistent with jet quenching in hot medium.

First observation of an additional suppression of Υ(2S+3S) relatively to Υ(1S) by a factor ~3 in PbPb vs pp

15-30% increase in integral elliptic flow coefficient v2 from top RHIC to LHC energy

Phys. Lett. B 703 (2011) 246

CMS HIN-10-002

Phys. Rev. C 84 (2011) 024906

HIN -10-02 , Phys. Lett. & Rev MSU

HIN -10-02 , Phys. Lett. & Rev MSU


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Example: Single Top Quark

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Evidence for t-channel single top quark production in CMS by two methods

2D analysis

The measured cross section 83.6 ± 29.8(stat+sys) ± 3.3(lumi) pbis consistent with the Standard Model prediction 64.3 pb Phys. Rev. Lett. 107, 091802 (2011)

Boosted decision tree analysis

CMS-TOP-11-021IHEP, MSU

CMS-TOP-11-021IHEP, MSU


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An important meeting where a strategy for RDMS contribution to the Upgrade of CMS has been outlined.

The main areas of the RDMS participation:

a) ME1/1/ and HE full RDMS responsibility; b) ME4/2, EE, HF share with other countries.

The areas of potential RDMS contribution:

Forward muon systemsHO SiPMs (Hadronic Calorimeter Tail Catcher)HF PMTs (Forward Hadron Calorimeter eta 3-5)New HB/HE photo-detectorsMajor consolidation/replacement of electronics systemsincluding potentially ECAL electronicsCalorimeter Endcaps (subject of a task force)

Management Workshop on the CMS Upgrade StrategyDubna, February 21-22


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CMS Upgrade Technical Proposal

• TP covers LS1-2 through 2020– Participation in sub-systems

• according initial MoU institute responsibilities

– Total cost preliminary estimate~65 MCHF– Contribution scale

• proportional to number of PhDs

– For RDMS-DMS is ~ 1 MCHF in total:• Common fund in cash ~ 100 kCHF• ME1/1 ~ 500 kCHF• HCAL ~ 400 kCHF

– For RDMS-RF is ~ 3 MCHF in total:• Common fund in cash ~ 300 kCHF• ME4/2 ~ 1300 kCHF• HCAL ~ 1400 kCHF

• TP covers LS1-2 through 2020– Participation in sub-systems

• according initial MoU institute responsibilities

– Total cost preliminary estimate~65 MCHF– Contribution scale

• proportional to number of PhDs

– For RDMS-DMS is ~ 1 MCHF in total:• Common fund in cash ~ 100 kCHF• ME1/1 ~ 500 kCHF• HCAL ~ 400 kCHF

– For RDMS-RF is ~ 3 MCHF in total:• Common fund in cash ~ 300 kCHF• ME4/2 ~ 1300 kCHF• HCAL ~ 1400 kCHF


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CMS Remote Operation Center at Moscow State University– ROC MSU

On-line monitoring: interactive access to the information network of the CMS experiment (CMS private network)Operation of ROC-MSU: 2010 – 8 shitts, 2011 – 92 shitts (HCAL Remote) successfully carried out

operation room conference room

operation point A operation point B communication point


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HF Radiation Monitor System future upgrade in 2011-14

1. Increasing of the number of the points of measurements to reproduce the neutron field in the UXC.

2. Modification of a number of the neutron monitors for neutron spectrum estimation.

3. Modification of a number of the gamma-counters for the measurements In the electronics area.

4. Upgrade of the HF RadMon readout electronics for the long term independent monitoring of the highest luminosity

5. Full integration of the HF RadMon data in CMS beam radiation monitoring system.


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ALICEALICE



RUSSIA

in

LHC

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The following ALICE detectors were built, installed, commissioned and are operated with participation of the Russian institutes.

Photon spectrometer PHOSNRC “KI”, Sarov, IHEP, JINR leadership of the NRC “KI” DIMUON spectrometerPNPI, Sarov (only at the construction phase), JINR Trigger detector T0INR, MEPhI, NRC “KI”, BINP leading role of the Russian institutes Time-of-flight detector TOFITEP Internal tracking ITSS.PbSU

• In 2011, all these detectors, as well as the other ALICE detectors, are successfully, with high efficiency, operating in LHC runs.


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Physics

Physics of direct photons, neutral mesons, and jets.

NRC “Kurchatov Institute”, IHEP, JINR, Sarov Resonances. PNPI , ITEP, JINR Long range correlations in pp and AA

collisions. SPbSU Ultra-peripheral collisionsINR, PNPI

Current activities of the Russian institutes

Analysis of the 2010 and 2011 data is continuing and further physics results are at various advanced stages of preparation.

Currently, the Russian institutes are mostly focused on the following topics.


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PHOS preliminary results

xT scaling properties of 0 and meson production in pp

collisions at s=0.9, 2.76 and 7 TeV

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Suppression of 0 production in PbPb was observed at different collision centrality classes. Good agreement with other ALICE measurements: 0 reconstruction via converted photons and charged .


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Pb-Pb at √sNN = 2.76 TeV (10 Mevents) centrality dependence of the K*(892)0 Kπ signal

ITEP

centrality: 0 – 10%10 - 30% 30 - 50%

50 - 100%

K*(892)0 mass does not depend on theevent centrality. Its value is close to the PDG one.

Hint on broadening the signal with centrality


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Primary charged particle multiplicity measurement (Pb-Pb @2.76 TeV)

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Preliminary T0 results are shown here.

These values are consistent within error bars with FMD & VZERO.

0-5%

5-10%

10-20 %

20-30%

30-40%


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Proposals for the ALICE upgradewith Russian participation

Improvement of the PHOS spectrometerNRC “Kurchatov institute”, IHEP Protvino, VNIIEF Sarov, JINR Dubna

Development of a “Focusing Aerogel RICH Detector” (FARICH)INR RAS, BINP, Boreskov institute

Muon flavour trackerPNPI; Gatchina; Russia

Improvement of T0 detectorINR RAS, MEPhI, RNC “Kurchatov institute”

ITS upgrade SPb State University; St. Petersburg; Russia


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Improvement of the PHOS spectrometerLoI submitted in September, 2011

Russian team expresses an interest to develop and produce a new electronics for the PHOS spectrometer with the following goals:

•To significantly improve the PHOS timing resolution in order to improve conditions for measuring direct thermal photons by using time-of-flight cut for selection of the photon clusters;•To increase the data readout bandwidth and thereby PHOS trigger rate capability in order to cope with the increased luminosity after the LHC upgrade in 2017/18.

Timing resolution 0.5 nsNo TOF cut

NRC “Kurchatov institute”, IHEP Protvino, RFNC- VNIIEF Sarov, JINR Dubna,


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Development of the FARICH detector for the Upgrade of the ALICE HMPID system

INR RAS, BINP, Boreskov institute

There is an interest to develop and produce the Focusing Aerogel Ring Imaging Cherenkov (FARICH) detector for the upgrade of the CERN ALICE high momentum PID (HMPID) system.

The development of the FARICH detector is proposed with the goal to extend the working momentum range of the charged particle identification at ALICE up to 10 GeV/c for the pion–kaon separation and up to 15 GeV/c for kaon–proton separation.


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Motivation - Suppression of after-pulse effects on the triggering (« after-triggers ») , luminosity and hit selection for T0F

T0 upgrade

Options• Detector upgrade - A new scintillation detector to place before Cerenkov’

detector. Coincidence of these detectors - Modernization Cerenkov detector – to add scintillation (τ≈10

ns) to radiator. Suppression according to their shape. - To use microchannels PMTs• The upgrade of the electronics

INR RAS, MEPhI, RNC “Kurchatov institute”


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LHCbLHCb



RUSSIA

in

LHC

33

Calorimeters• Operationsmoothly, no problems• Calibrationπ0 → γ γ mass resolution: σ = 7.5 MeV/c2

• particle identificationelectron ID: ~3% misidentification rate for 90% efficiencyJ/ψ → e+ e- mass resolution: σ ~ 70MeV/c2

B → K* γBs → Ф γ


χb→ Υ(1S) γ

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MUON(rediscoveries)

Performing very well, no problems


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Participation in current analysis

Studies of beauty baryons decaying to D0 p π and D0 p KCERN-LHCb-CONF-2011-036

Measurement of the Ratio of Branching Fractions BR(B -> J/ψπ) and BR(BR(B -> J/ψK)

CERN-LHCb-CONF-2011-030

Time-dependent analyses of two-body charm decays

CERN-LHCb-ANA-2011-066

Observation of J/ψ+open charm and double open charm production

CERN-LHCb-ANA-2011-067

Measurement of the Ratio of Branching Fractions BR(B -> K* γ) and BR(BR(Bs -> Ф γ) CERN-LHCb-ANA-2011-064

Search for Bs → μμ CERN-LHCb-CONF-2011-047


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LHCb upgrade news

LOI presented and submitted to the LHCCat the beginning of March 2011

LHCb upgrade fully endorsed by LHCC on June 15

• Mission of current LHCb:

– Indirect search for New Physics via CP asymmetries and rare decays

– Main focus on flavour physics with b- and c- decays

• LHCb Phase-1: Collect ~5 fb-1 before 2nd LHC shutdown

next step →TDR


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• Mission of upgrade for LHCb:

– General purpose detector in the forward region with fully software based trigger (40 MHz)

– Quark flavour physics is the core program, expand physics program to include:

• Lepton flavour physics

• Electroweak physics

• Exotic searches

– Possible due to fully software trigger

• LHCb Phase-2:

– Collect 50 fb-1 with upgraded detector at √s = 14 TeV

• Detector upgrades:

– Main installation in second long shutdown

– trigger upgrade

New pixel detector

Remove SPD/PRS

NewTT

Upgrade Readout

New ITReplace OT electronics

Change HPD’s to MAPMT’s TORCH

RICH-2RICH-1

LHCb upgrade news


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• Project:

Major Projects

• Improvement of tracking:

• Other activities: CALO, MUON, PID

• New Velo @40 MHz readout – Baseline option: pixel detector: VELOPIX

based on Timepix chip• 55 μm x 55 μm pixel size

– Alternative option: strip detector

IT-Fiber detectors:

• Si strip detector• Scintillator fiber detector – baseline for TDR

• new VELO (pixel detector)

• Tracker (inner)

readout electronics: 1 MHz → 40 MHz

• develop new technology• wide application, not only in HEP


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Conclusion All four detectors were sustainably operating during 18 months at the never

seen energy of 7 TeV and luminosity upto 1033 cm-2s-1 of colliding proton beams. Plenty of rediscoveries and some new phenomena observed show a good shape of the detectors though no deviations from SM are revealed yet.

Three of four detectors experienced collisions of the lead-ion beams with unprecedented energies and started to explore the matter in the highly dense and hot phase. They are preparing to a new HI run which is planned for this Fall.

In this exciting era of discoveries in particle physics the Russian institutions are strongly involved in the detector operation, data taking and analysis, and physics simulations with the continuing funding support from the Russian government as it was done during the detector construction period.

At the same time one should keep in mind the next development plans for the LHC Project which mean to increase the energy by factor two and the luminosity by two orders of magnitude. It will demand essential efforts and additional financial contributions from all participants of the Project.


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Muon spectrometr upgrade: motivations

Regular cylindrical beampipe should be replaced by a thin (thickness < 1 mm) conical beampipe of Be.

Regular cylindrical beampipe would cause excessive matter that creates multiple scattering and secondaries and degradation of the detector performance

Production of such Be beampipe is quite complex due to the fact that Be is a very harmful material.


the 34 th meeting of the cern-russia committee participation of russian institutions in the lhc...

Documents

atlas detector

atlas hec

atlas slhc upgrade mephinikef

usual atlas dt

atlas endcap calorimeters

jet physics dijet

high radiation levels

new physics participation