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

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Presentation on theme: "Guoming CHEN12015-5-4 The Capability of CMS Detector Chen Guoming IHEP, CAS 2008.10.24, Beijing."— Presentation transcript:

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

2 Guoming CHEN2 CMS B field: 4T

3 Guoming CHEN 3 CMS η coverage

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 Guoming CHEN5 Vertex detector: Si pixel space resolution: 10 μm 10 μm

6 Guoming CHEN6 Si Strip TRACKER

7 Guoming CHEN7 Momentum resolution

8 Guoming CHEN8 Material budget

9 Guoming CHEN9 ECAL – PbWO Crystals

10 Guoming CHEN10

11 Guoming CHEN11 ECAL Test Beam Module

12 Guoming CHEN12 Electron and Gamma Energy Resolution

13 Guoming 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 Guoming CHEN14 Jet energy resolution

15 Guoming 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 Guoming CHEN16 Barrel MUCH

17 Guoming CHEN EndcapMUCH

18 Guoming CHEN18 Muon momentum resolution

19 Guoming CHEN19 Particle ID

20 Guoming CHEN 20 Trigger table: 2x10 33 cm -2 s -1 TriggerThreshold (GeV ) Rate (Hz) Cuml. rate (Hz) Inclusive electron Di-electron17134 Inclusive photon Di-photon 40, Inclusive muon Di-muon7472 Inclusive tau-jet Di-tau-jet jet * E T miss 180 * jet OR 3-jet OR 4-jet 657, 247, Electron * jet 19 * Inclusive b-jet Calibration etc TOTAL105

21 Guoming CHEN21 CMS installation

22 Guoming CHEN22 Beampipe installation before Closure

23 Guoming CHEN23 Final Closure

24 Guoming CHEN24 Cosmic ray test

25 Guoming CHEN25 Collimator Spray

26 Guoming CHEN26 Tracker Alignment with cosmic rays CRUZET4 TIB Transverse impact point – using cosmics to align tracker

27 Guoming 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 Guoming CHEN28 Higgs search New !

29 Guoming CHEN29 Probability of Higgs mass Jens Erler

30 Guoming CHEN30 H → γγis the first channel at CMS

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

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

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

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

36 Guoming CHEN36 Summary of the Discovery Potential for the SM Higgs Boson

37 Guoming 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 Guoming 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 Guoming CHEN39 SUSY – Squark/Gluino Mass “ Reach ”

40 Guoming CHEN 40 Sparticle Masses endpoint in M ll 10 fb -1

41 Guoming CHEN41 5σDiscovery potential for neutral MSSM Higgs

42 Guoming CHEN42 Discovery potential for charged Higgs bosons

43 Guoming CHEN43 Conclusions Expected Higgs boson searches in CMS: 10 fb -1 : discovery in H->ZZ*/ZZ and H->WW* H → γγ possible fb -1 : discovery in H->  (full SM mass range reached) observation of many other Higgs channels   first measurement of Higgs boson properties 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 Guoming CHEN44 Thanks

45 Guoming CHEN45 backup backup

46 Guoming CHEN46 Higgs production

47 Guoming CHEN47 Cross section

48 Guoming CHEN48 Higgs decay

49 Guoming CHEN49

50 Guoming CHEN50 Sparticles mass resolution


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