1. Guoming CHEN12015-5-4 The Capability of CMS Detector Chen Guoming IHEP, CAS 2008.10.24, Beijing

2. 2015-5-4Guoming CHEN2 CMS B field: 4T

3. 2015-5-4 Guoming CHEN 3 CMS η coverage

4. 2015-5-4 Guoming CHEN 4 Inner Tracker – All Si 5.4 m Outer Barrel –TOB- Inner Barrel –TIB- End cap –TEC- Pixel 2,4 m Inner Disks –TID- 210 m 2 of silicon sensors 6,136 Thin detectors (1 sensor) 9,096 Thick detectors (2 sensors) 9,648,128 electronics channels

5. 2015-5-4Guoming CHEN5 Vertex detector: Si pixel space resolution: 10 μm 10 μm

6. 2015-5-4Guoming CHEN6 Si Strip TRACKER

7. 2015-5-4Guoming CHEN7 Momentum resolution

8. 2015-5-4Guoming CHEN8 Material budget

9. 2015-5-4Guoming CHEN9 ECAL – PbWO Crystals

10. 2015-5-4Guoming CHEN10

11. 2015-5-4Guoming CHEN11 ECAL Test Beam Module

12. 2015-5-4Guoming CHEN12 Electron and Gamma Energy Resolution

13. 2015-5-4Guoming CHEN13 CMS - HCAL Back-flange 18 Brackets 3 Layers of absorber Made of brass and scintillator. Radiation tolerant scintillator and HPD photo transducer works in 4T field.

14. 2015-5-4Guoming CHEN14 Jet energy resolution

15. 2015-5-4Guoming CHEN15 CMS Muon System Three types of gaseous detectors Drift Tubes in barrel region Drift Tubes in barrel region 4 stations interleaved with iron return yoke 4 stations interleaved with iron return yoke Cathod Strip Chambers in endcap regions Cathod Strip Chambers in endcap regions 4 stations interleaved with iron return yoke 4 stations interleaved with iron return yoke Up to |  | < 2.4 Up to |  | < 2.4 Resistive Plate Chambers in both barrel and endcaps Resistive Plate Chambers in both barrel and endcaps precise bunch crossing ID for Trigger precise bunch crossing ID for Trigger Up to |  | < 2.1 Up to |  | < 2.1

16. 2015-5-4Guoming CHEN16 Barrel MUCH

17. Guoming CHEN172015-5-4 EndcapMUCH

18. Guoming CHEN18 Muon momentum resolution

19. 2015-5-4Guoming CHEN19 Particle ID

20. 2015-5-4 Guoming CHEN 20 Trigger table: 2x10 33 cm -2 s -1 TriggerThreshold (GeV ) Rate (Hz) Cuml. rate (Hz) Inclusive electron 293333 Di-electron17134 Inclusive photon 80438 Di-photon 40, 25 543 Inclusive muon 192568 Di-muon7472 Inclusive tau-jet 86375 Di-tau-jet59176 1-jet * E T miss 180 * 123 581 1-jet OR 3-jet OR 4-jet 657, 247, 113 989 Electron * jet 19 * 45 290 Inclusive b-jet 237595 Calibration etc 10105 TOTAL105

21. 2015-5-4Guoming CHEN21 CMS installation

22. 2015-5-4Guoming CHEN22 Beampipe installation before Closure

23. 2015-5-4Guoming CHEN23 Final Closure

24. 2015-5-4Guoming CHEN24 Cosmic ray test

25. 2015-5-4Guoming CHEN25 Collimator Spray

26. 2015-5-4Guoming CHEN26 Tracker Alignment with cosmic rays CRUZET4 TIB Transverse impact point – using cosmics to align tracker

27. 2015-5-4Guoming CHEN27 Summary CMS has no dead region from -5 to 5 of ηCMS has no dead region from -5 to 5 of η CMS emphasizes muon, gamma and electron measurementCMS emphasizes muon, gamma and electron measurement CMS was produced, installed and tested. Every piece works well, it is ready for physicsCMS was produced, installed and tested. Every piece works well, it is ready for physics

28. 2015-5-4Guoming CHEN28 Higgs search New !

29. 2015-5-4Guoming CHEN29 Probability of Higgs mass Jens Erler

30. 2015-5-4Guoming CHEN30 H → γγis the first channel at CMS

31. 2015-5-4Guoming CHEN31 Discovery potential of H->  SM Significance for SM Higgs M H =130 GeV for 30 fb -1 * * NN with kinematics and  isolation as input, s/b per event

32. 2015-5-4Guoming CHEN32 H ->ZZ*/ZZ -> 4 leptons Incase Higgs mass> 120 GeV Backgrounds from tt, ZZ*,ZZ, Zbb

33. 2015-5-4Guoming CHEN33 H ->ZZ*/ZZ -> 4e H ->ZZ*/ZZ -> 4  30 fb -1 H ->ZZ*/ZZ -> 4 

34. 2015-5-4Guoming CHEN34 Higgs boson mass, width and production cross section from H ->ZZ*/ZZ -> 4 leptons H ->ZZ*/ZZ -> 4 

35. 2015-5-4Guoming CHEN35 H -> WW * -> l l Around m H ~ 170 GeV, best channel Backgrounds from WW, WZ, Wt, tt production Earlydiscovery channel !

36. 2015-5-4Guoming CHEN36 Summary of the Discovery Potential for the SM Higgs Boson

37. 2015-5-4Guoming CHEN37 Supersymmetry particles 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 Lightest SUSY particle stable: dark matter candidate ? MET error CMS

38. 2015-5-4Guoming CHEN38 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

39. 2015-5-4Guoming CHEN39 SUSY – Squark/Gluino Mass “ Reach ”

40. 2015-5-4 Guoming CHEN 40 Sparticle Masses endpoint in M ll 10 fb -1

41. 2015-5-4Guoming CHEN41 5σDiscovery potential for neutral MSSM Higgs

42. 2015-5-4Guoming CHEN42 Discovery potential for charged Higgs bosons

43. 2015-5-4Guoming CHEN43 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->  (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

44. 2015-5-4Guoming CHEN44 Thanks

45. 2015-5-4Guoming CHEN45 backup backup

46. 2015-5-4Guoming CHEN46 Higgs production

47. 2015-5-4Guoming CHEN47 Cross section

48. 2015-5-4Guoming CHEN48 Higgs decay

49. 2015-5-4Guoming CHEN49

50. 2015-5-4Guoming CHEN50 Sparticles mass resolution