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The Capability of CMS Detector. Chen Guoming IHEP, CAS 2008.10.24, Beijing. CMS. B field: 4T. CMS η coverage. Inner Tracker – All Si. Pixel. End cap –TEC-. Outer Barrel –TOB-. Inner Barrel –TIB-. Inner Disks –TID-. 2,4 m. 5.4 m. 210 m 2 of silicon sensors - PowerPoint PPT Presentation
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Guoming CHEN Guoming CHEN 1123/4/2123/4/21
The Capability of CMS The Capability of CMS DetectorDetector
Chen GuomingChen Guoming
IHEP, CASIHEP, CAS
2008.10.24, Beijing2008.10.24, Beijing
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CMS
B field: 4TB field: 4T
23/4/2123/4/21 Guoming CHEN Guoming CHEN 33
CMS CMS ηη coveragecoverage
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Inner Tracker Inner Tracker –– All Si All Si
5.4 m
Outer Barrel –TOB-
Inner Barrel –TIB-
End cap –TEC-Pixel
2,4
m
Inner Disks –TID-
210 m2 of silicon sensors6,136 Thin detectors (1 sensor)9,096 Thick detectors (2 sensors)9,648,128 electronics channels
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Vertex detector: Si pixelVertex detector: Si pixel
space space resolutionresolution::
10 10 μμmm
23/4/2123/4/21 Guoming CHEN Guoming CHEN 66
Si Strip TRACKERSi Strip TRACKER
23/4/2123/4/21 Guoming CHEN Guoming CHEN 77
Momentum resolutionMomentum resolution
23/4/2123/4/21 Guoming CHEN Guoming CHEN 88
Material budgetMaterial budget
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ECAL ECAL –– PbWO Crystals PbWO Crystals
23/4/2123/4/21 Guoming CHEN Guoming CHEN 1010
23/4/2123/4/21 Guoming CHEN Guoming CHEN 1111
ECAL Test Beam ModuleECAL Test Beam Module
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Electron and Gamma Energy Electron and Gamma Energy ResolutionResolution
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CMS - HCAL CMS - HCAL
Back-flange18 Brackets3 Layers of absorber
Made of brass and scintillator. Radiation tolerant scintillator and HPD photo transducer works in 4T field.
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Jet energy resolutionJet energy resolution
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CMS Muon SystemCMS Muon SystemThree types of gaseous Three types of gaseous
detectorsdetectors• Drift Tubes in barrel Drift Tubes in barrel
regionregion• 4 stations 4 stations
interleaved with interleaved with iron return yokeiron return yoke
• Cathod Strip Chambers Cathod Strip Chambers in endcap regionsin endcap regions
• 4 stations 4 stations interleaved with interleaved with iron return yokeiron return yoke
• Up to |Up to || < 2.4| < 2.4• Resistive Plate Resistive Plate
Chambers in both barrel Chambers in both barrel and endcapsand endcaps
• precise bunch precise bunch crossing ID for crossing ID for TriggerTrigger
• Up to |Up to || < 2.1| < 2.1
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Barrel MUCHBarrel MUCH
Guoming CHEN Guoming CHEN 171723/4/2123/4/21
EndcapEndcapMUCHMUCH
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Muon momentum resolutionMuon momentum resolution
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Particle ID
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Trigger Trigger
table: table: 2x102x103333 cmcm-2-2ss-1-1
TriggerTrigger ThresholdThreshold(GeV )(GeV )
Rate (Hz)Rate (Hz) Cuml. rate Cuml. rate (Hz)(Hz)
Inclusive electronInclusive electron 2929 3333 3333
Di-electronDi-electron 1717 11 3434
Inclusive photonInclusive photon 8080 44 3838
Di-photonDi-photon 40, 2540, 25 55 4343
Inclusive muonInclusive muon 1919 2525 6868
Di-muonDi-muon 77 44 7272
Inclusive tau-jetInclusive tau-jet 8686 33 7575
Di-tau-jetDi-tau-jet 5959 11 7676
1-jet * E1-jet * ETTmissmiss 180 * 123180 * 123 55 8181
1-jet OR 3-jet OR 1-jet OR 3-jet OR 4-jet4-jet
657, 247, 113657, 247, 113 99 8989
Electron * jetElectron * jet 19 * 4519 * 45 22 9090
Inclusive b-jetInclusive b-jet 237237 55 9595
Calibration etcCalibration etc 1010 105105
TOTALTOTAL 105105
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CMS installationCMS installation
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Beampipe installation before Beampipe installation before ClosureClosure
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Final ClosureFinal Closure
23/4/2123/4/21 Guoming CHEN Guoming CHEN 2424
Cosmic ray testCosmic ray test
23/4/2123/4/21 Guoming CHEN Guoming CHEN 2525
Collimator SprayCollimator Spray
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Tracker Alignment with cosmic Tracker Alignment with cosmic raysrays CRUZET4
TIB
Transverse impact point – using cosmics to align tracker
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SummarySummary
• CMS has no dead region from -5 to 5 CMS has no dead region from -5 to 5 of of ηη
• CMS emphasizes muon, gamma and CMS emphasizes muon, gamma and electron measurementelectron measurement
• CMS was produced, installed and CMS was produced, installed and tested. Every piece works well, it is tested. Every piece works well, it is ready for physicsready for physics
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Higgs searchHiggs search
New !
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Probability of Higgs massProbability of Higgs mass
Jens ErlerJens Erler
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H→H→γγγγis the first channel at CMS is the first channel at CMS
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Discovery potential of H-Discovery potential of H->>
SMSM
Significance for SM Higgs MSignificance for SM Higgs MHH=130 GeV for 30 fb=130 GeV for 30 fb-1-1
* * NN with kinematics and isolation as input, s/b per event
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H ->ZZ*/ZZ -> 4 leptons
Incase Higgs mass> 120 GeV
Backgrounds from tt, ZZ*,ZZ, Zbb
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H ->ZZ*/ZZ -> 4e H ->ZZ*/ZZ -> 4
30 fb30 fb-1-1
H ->ZZ*/ZZ -> 4
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Higgs boson mass, width and production cross section from H
->ZZ*/ZZ -> 4 leptons
H ->ZZ*/ZZ -> 4
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H -> WW* -> ll
Around mH ~ 170 GeV,best channel
Backgrounds from WW, WZ, Wt, tt production Early Early
discoverydiscoverychannel !channel !
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Summary of the Discovery Potential for the SM Higgs
Boson
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Supersymmetry particlesSupersymmetry particlesLots of new particles (squarks, sleptons,…) predicted with masses in the range from 10’s of GeV’s up to several TeV range
Lightest SUSY particle stable: dark matter candidate ?
MET error
CMSCMS
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SUSY - DiscoverySUSY - Discovery
4
1
( ) ( jets)eff T TM P P
backgrounds
SUSY600 GeV
squark
Dramatic event signatures ( cascade to LSP -> jets + Missing Et) and large cross section mean we will discover SUSY quickly, if sparticle mass is not very heavy
23/4/2123/4/21 Guoming CHEN Guoming CHEN 3939
SUSY SUSY –– Squark/Gluino Mass Squark/Gluino Mass ““ReachReach””
23/4/2123/4/21 Guoming CHEN Guoming CHEN 4040
Sparticle MassesSparticle Masses
endpoint in Mll
0 02 1
10 fb-1
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55σσDiscovery potential for neutral MSSM Discovery potential for neutral MSSM HiggsHiggs
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Discovery potential for charged Higgs bosons
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ConclusionsConclusions
Expected Higgs boson searches in CMS: 10 fb-1: discovery in H->ZZ*/ZZ and H->WW* H→γγ possible 30-60 fb-1: discovery in H->(full SM mass range reached) observation of many other Higgs channels first measurement of Higgs boson properties
100-300 fb-1: observation of rare Higgs channels (WH,ttH,H->,...) precise measurement of Higgs boson properties
Expected SUSY searhes: - Low-mass SUSY visible almost immediately in many channels - Reconstruction of decay chains possible with the help of
endpoints
Full simulation results for many other channels and scenarios: - Extra dimensions - Alternative BSM signatures ...were not discussed
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ThanksThanks
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• backupbackup
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Higgs productionHiggs production
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Cross sectionCross section
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Higgs decayHiggs decay
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