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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
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The Capability of CMS Detector Chen Guoming IHEP, CAS 2008.10.24, Beijing Guoming CHEN
CMS B field: 4T Guoming CHEN
CMS ηcoverage Guoming CHEN
Inner Tracker – All Si Pixel End cap –TEC- Outer Barrel –TOB- Inner Barrel –TIB- Inner Disks –TID- 2,4 m 5.4 m 210 m2 of silicon sensors 6,136 Thin detectors (1 sensor) 9,096 Thick detectors (2 sensors) 9,648,128 electronics channels Guoming CHEN
Vertex detector: Si pixel space resolution: 10 μm Guoming CHEN
Si Strip TRACKER Guoming CHEN
Momentum resolution Guoming CHEN
Material budget Guoming CHEN
ECAL – PbWO Crystals Guoming CHEN
ECAL Test Beam Module Guoming CHEN
Electron and Gamma Energy Resolution Guoming CHEN
CMS - HCAL Made of brass and scintillator. Radiation tolerant scintillator and HPD photo transducer works in 4T field. Back-flange 18 Brackets 3 Layers of absorber Guoming CHEN
Jet energy resolution Guoming CHEN
CMS Muon System Three types of gaseous detectors • Drift Tubes in barrel region • 4 stations interleaved with iron return yoke • Cathod Strip Chambers in endcap regions • 4 stations interleaved with iron return yoke • Up to || < 2.4 • Resistive Plate Chambers in both barrel and endcaps • precise bunch crossing ID for Trigger • Up to || < 2.1 Guoming CHEN
Barrel MUCH Guoming CHEN
Endcap MUCH Guoming CHEN
Muon momentum resolution Guoming CHEN
Particle ID Guoming CHEN
Trigger table: 2x1033cm-2s-1 Guoming CHEN
CMS installation Guoming CHEN
Beampipe installation before Closure Guoming CHEN
Final Closure Guoming CHEN
Cosmic ray test Guoming CHEN
Collimator Spray Guoming CHEN
Tracker Alignment with cosmic rays CRUZET4 TIB Transverse impact point – using cosmics to align tracker Guoming CHEN
Summary • CMS has no dead region from -5 to 5 of η • CMS emphasizes muon, gamma and electron measurement • CMS was produced, installed and tested. Every piece works well, it is ready for physics Guoming CHEN
New ! Higgs search Guoming CHEN
Probability of Higgs mass Jens Erler Guoming CHEN
H→γγis the first channel at CMS Guoming CHEN
Discovery potential of H->gg SM Significance for SM Higgs MH=130 GeV for 30 fb-1 * NN with kinematics and g isolation as input, s/b per event Guoming CHEN
H ->ZZ*/ZZ -> 4 leptons Incase Higgs mass> 120 GeV Backgrounds from tt, ZZ*,ZZ, Zbb Guoming CHEN
H ->ZZ*/ZZ -> 4e H ->ZZ*/ZZ -> 4m 30 fb-1 H ->ZZ*/ZZ -> 4m Guoming CHEN
Higgs boson mass, width and production cross section fromH ->ZZ*/ZZ -> 4 leptons H ->ZZ*/ZZ -> 4m Guoming CHEN
H -> WW* -> lnln Around mH ~ 170 GeV, best channel Backgrounds from WW, WZ, Wt, tt production Early discovery channel ! Guoming CHEN
Summary of the Discovery Potential for the SM Higgs Boson Guoming CHEN
Supersymmetry particles • Lots of new particles (squarks, sleptons,…) predicted with masses in the range from 10’s of GeV’s up to several TeV range CMS MET error Lightest SUSY particle stable: dark matter candidate ? Guoming CHEN
SUSY - Discovery backgrounds SUSY 600 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 Guoming CHEN
SUSY – Squark/Gluino Mass “Reach” Guoming CHEN
Sparticle Masses endpoint in Mll 10 fb-1 Guoming CHEN
5σDiscovery potential for neutral MSSM Higgs Guoming CHEN
Discovery potential for charged Higgs bosons Guoming CHEN
Conclusions • 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->gg (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->gg,...) • 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 Guoming CHEN
Thanks Guoming CHEN
backup Guoming CHEN
Higgs production Guoming CHEN
Cross section Guoming CHEN
Higgs decay Guoming CHEN