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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
2
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
17 October 2011, Geneva Victor Savrin
3
The 34th Meeting of the CERN-Russia Committee
ATLASATLAS
17 October 2011, Geneva Victor Savrin
RUSSIA
in
LHC
4 417 October 2011, Geneva Victor Savrin
Rediscoveries:
Production of D*± , D± and Ds±
in pp collisions at 7 GeV
5
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.
17 October 2011, Geneva Victor Savrin
Rediscoveries:
6
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
17 October 2011, Geneva Victor Savrin
Higgs boson search
7
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
17 October 2011, Geneva Victor Savrin
88
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.
17 October 2011, Geneva Victor Savrin
9
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
17 October 2011, Geneva Victor Savrin
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.
17 October 2011, Geneva Victor Savrin
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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
17 October 2011, Geneva Victor Savrin
12
CMSCMS
The 34th Meeting of the CERN-Russia Committee
17 October 2011, Geneva Victor Savrin
RUSSIA
in
LHC
13
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
17 October 2011, Geneva Victor Savrin
14
Example: Di-muons
14
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
17 October 2011, Geneva Victor Savrin
All known resonances are re-discovered in DY
15
Example: right handed WR and heavy Majorana neutrino
15
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).
17 October 2011, Geneva Victor Savrin
16
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
17 October 2011, Geneva Victor Savrin
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Example: Single Top Quark
17
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
17 October 2011, Geneva Victor Savrin
18
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
17 October 2011, Geneva Victor Savrin
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19
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
17 October 2011, Geneva Victor Savrin
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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
17 October 2011, Geneva Victor Savrin
21
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.
17 October 2011, Geneva Victor Savrin
22
ALICEALICE
The 34th Meeting of the CERN-Russia Committee
17 October 2011, Geneva Victor Savrin
RUSSIA
in
LHC
23
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.
17 October 2011, Geneva Victor Savrin
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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.
17 October 2011, Geneva Victor Savrin
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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
25
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 .
17 October 2011, Geneva Victor Savrin
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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
17 October 2011, Geneva Victor Savrin
27
Primary charged particle multiplicity measurement (Pb-Pb @2.76 TeV)
27
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%
17 October 2011, Geneva Victor Savrin
28
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
17 October 2011, Geneva Victor Savrin
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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,
17 October 2011, Geneva Victor Savrin
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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.
17 October 2011, Geneva Victor Savrin
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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”
17 October 2011, Geneva Victor Savrin
32
LHCbLHCb
The 34th Meeting of the CERN-Russia Committee
17 October 2011, Geneva Victor Savrin
RUSSIA
in
LHC
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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
17 October 2011, Geneva Victor Savrin
χb→ Υ(1S) γ
34
MUON(rediscoveries)
Performing very well, no problems
17 October 2011, Geneva Victor Savrin
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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
17 October 2011, Geneva Victor Savrin
36
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
17 October 2011, Geneva Victor Savrin
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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
17 October 2011, Geneva Victor Savrin
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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
17 October 2011, Geneva Victor Savrin
39
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.
3917 October 2011, Geneva Victor Savrin
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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.
17 October 2011, Geneva Victor Savrin