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The Capability of CMS Detector

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

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  1. The Capability of CMS Detector Chen Guoming IHEP, CAS 2008.10.24, Beijing Guoming CHEN

  2. CMS B field: 4T Guoming CHEN

  3. CMS ηcoverage Guoming CHEN

  4. 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

  5. Vertex detector: Si pixel space resolution: 10 μm Guoming CHEN

  6. Si Strip TRACKER Guoming CHEN

  7. Momentum resolution Guoming CHEN

  8. Material budget Guoming CHEN

  9. ECAL – PbWO Crystals Guoming CHEN

  10. Guoming CHEN

  11. ECAL Test Beam Module Guoming CHEN

  12. Electron and Gamma Energy Resolution Guoming CHEN

  13. 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

  14. Jet energy resolution Guoming CHEN

  15. 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

  16. Barrel MUCH Guoming CHEN

  17. Endcap MUCH Guoming CHEN

  18. Muon momentum resolution Guoming CHEN

  19. Particle ID Guoming CHEN

  20. Trigger table: 2x1033cm-2s-1 Guoming CHEN

  21. CMS installation Guoming CHEN

  22. Beampipe installation before Closure Guoming CHEN

  23. Final Closure Guoming CHEN

  24. Cosmic ray test Guoming CHEN

  25. Collimator Spray Guoming CHEN

  26. Tracker Alignment with cosmic rays CRUZET4 TIB Transverse impact point – using cosmics to align tracker Guoming CHEN

  27. 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

  28. New ! Higgs search Guoming CHEN

  29. Probability of Higgs mass Jens Erler Guoming CHEN

  30. H→γγis the first channel at CMS Guoming CHEN

  31. 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

  32. H ->ZZ*/ZZ -> 4 leptons Incase Higgs mass> 120 GeV Backgrounds from tt, ZZ*,ZZ, Zbb Guoming CHEN

  33. H ->ZZ*/ZZ -> 4e H ->ZZ*/ZZ -> 4m 30 fb-1 H ->ZZ*/ZZ -> 4m Guoming CHEN

  34. Higgs boson mass, width and production cross section fromH ->ZZ*/ZZ -> 4 leptons H ->ZZ*/ZZ -> 4m Guoming CHEN

  35. H -> WW* -> lnln Around mH ~ 170 GeV, best channel Backgrounds from WW, WZ, Wt, tt production Early discovery channel ! Guoming CHEN

  36. Summary of the Discovery Potential for the SM Higgs Boson Guoming CHEN

  37. 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

  38. 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

  39. SUSY – Squark/Gluino Mass “Reach” Guoming CHEN

  40. Sparticle Masses endpoint in Mll 10 fb-1 Guoming CHEN

  41. 5σDiscovery potential for neutral MSSM Higgs Guoming CHEN

  42. Discovery potential for charged Higgs bosons Guoming CHEN

  43. 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

  44. Thanks Guoming CHEN

  45. backup Guoming CHEN

  46. Higgs production Guoming CHEN

  47. Cross section Guoming CHEN

  48. Higgs decay Guoming CHEN

  49. Guoming CHEN

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