1. 05/11/2006Prof. dr hab. Elżbieta Richter-Wąs Physics Program of the experiments at L arge H adron C ollider Lecture 5

2. 05/11/2006 2 Prof. dr hab. Elżbieta Richter-Wąs Outline of this lecture Physics programme:  Higgs boson in SM and MSSM model

3. 05/11/2006 3 Prof. dr hab. Elżbieta Richter-Wąs “Theoretical” basics FermionsSymmetries Bosons, Interactions Three families, with with leptons and and quarks 1) Poincaré Group 2) 2) Gauge Symmetries: U(1) Y U(1) Y SU(2) L SU(2) L SU(3) c SU(3) c : QED,  : QED, g ’ : Weak, Z, W  : Weak, g (electroweak unification) : QCD, 8 gluons : QCD, g s uLdLuLdL, u R, d R. eL, R, e R, Only known solution: the Higgs Mechanism   cscs tbtb

4. 05/11/2006 4 Prof. dr hab. Elżbieta Richter-Wąs “Theoretical” basics + Self-interaction via V(  ): m f /v m 2 /v  m 2 /v 2 W,Z H m 2 = v 2 /3 H (unknown) All couplings predicted Mass unknown - v 4 /24 Empty vacuum (Our vacuum) Matter interacts with the quantum fluctuations of the vacuum as well as with the vacuum itself Ad hoc coupling

5. 05/11/2006 5 Prof. dr hab. Elżbieta Richter-Wąs “Theoretical basics”: are there bounds on m H ? Triviality bound =m H 2 /v 2 As for any other coupling constant, the particle content of the standard model determines the running of up to a scale , at which the model is no longer valid. Vacuum stability

6. 05/11/2006 6 Prof. dr hab. Elżbieta Richter-Wąs Higgs: Introduction

7. 05/11/2006 7 Prof. dr hab. Elżbieta Richter-Wąs Higgs: Present status of knowledge

8. 05/11/2006 8 Prof. dr hab. Elżbieta Richter-Wąs Higgs: production at hadron colliders

9. 05/11/2006 9 Prof. dr hab. Elżbieta Richter-Wąs Higgs boson branching fractions

10. 05/11/2006 10 Prof. dr hab. Elżbieta Richter-Wąs How can one claim a discovery?

11. 05/11/2006 11 Prof. dr hab. Elżbieta Richter-Wąs Maximising significance

12. 05/11/2006 12 Prof. dr hab. Elżbieta Richter-Wąs H  

13. 05/11/2006 13 Prof. dr hab. Elżbieta Richter-Wąs Simulated H  

14. 05/11/2006 14 Prof. dr hab. Elżbieta Richter-Wąs H   backgrounds

15. 05/11/2006 15 Prof. dr hab. Elżbieta Richter-Wąs H   irreducible backgrounds

16. 05/11/2006 16 Prof. dr hab. Elżbieta Richter-Wąs H   expected performance

17. 05/11/2006 17 Prof. dr hab. Elżbieta Richter-Wąs Tile Calorimeter Forward calo EM LAr Endcap EM LAr Barrel Had. endcap H   H  needs mass resolution ~ 1% response uniformity ≤ 0.7% e.m. calorimeter energy m  (GeV) 105 135120 over |  | < 2.5 As example : LAr electromagnetic calorimeter

18. 05/11/2006 18 Prof. dr hab. Elżbieta Richter-Wąs End-cap wheel in vertical position (24/6/03) Thickness of 1536 plates for EM endcap measured with ultrasounds during construction thickness of Pb absorber plates must be uniform to ~ 0.5%(~ 10  m) To keep energy response uniform to ~ 0.2-0.3% LAr Pb + - + + - - absorber  ~ 9  m  =2.2 mm e EM Endcap : Construction requirements

19. 05/11/2006 19 Prof. dr hab. Elżbieta Richter-Wąs Test of 4( out of 32 ) barrel, 3( out of 16 ) end-cap final modules Test of 4( out of 32 ) barrel, 3( out of 16 ) end-cap final modules BC1BC2 BC3BC4 S1 pion counter muon counter FeS3,4Pb Barrel module scan with high E electrons  =0  =46  =0  =15 Required uniformity in regions of size  x  = 0.2 x 0.4 ~ 0.5% (440 regions in the full ECAL) H8 beam line EM Barrel : 1999-2002 test beam

20. 05/11/2006 20 Prof. dr hab. Elżbieta Richter-Wąs x z y Geant4 simulation of test-beam set-up ~ O(1%) of ATLAS tested on CERN H8 beam line «final» electronics «final» detector modules monitoring ATLAS software to analyze data. Toward Physics : 2004 ATLAS Combined Test Beam

21. 05/11/2006 21 Prof. dr hab. Elżbieta Richter-Wąs TRT LAr Tilecal MDT-RPC BOS Pixels & SCT TRT LAr x z y 90 millions events collected( ~ 4.5 TB) e ±,  ±,  ±,  @ various energies, B=0  1.4 T beam Toward Physics : 2004 ATLAS Combined Test Beam

22. 05/11/2006 22 Prof. dr hab. Elżbieta Richter-Wąs E cell (GeV) Linearity E/E beam constant term~0.7% E(GeV) Energy resolution(1 cell)  /E(%) E beam (GeV) 100 200 100 points well within 1% Work in progress to understand the material in the beam line 200 Uniformity (e - 180 GeV) over 22 spots  0 0.62 9 GeV beam energy pb? Electronics calibration pb Uniformity~ 0.5% CTB: electron studies (preliminary results)

23. 05/11/2006 23 Prof. dr hab. Elżbieta Richter-Wąs H  ZZ (*)  llll

24. 05/11/2006 24 Prof. dr hab. Elżbieta Richter-Wąs Simulated H  ZZ (*)  llll

25. 05/11/2006 25 Prof. dr hab. Elżbieta Richter-Wąs Simulated H  ZZ (*)  llll

26. 05/11/2006 26 Prof. dr hab. Elżbieta Richter-Wąs H  ZZ (*)  llll: control of reducible background

27. 05/11/2006 27 Prof. dr hab. Elżbieta Richter-Wąs H  ZZ (*)  llll: analysis

28. 05/11/2006 28 Prof. dr hab. Elżbieta Richter-Wąs Vector boson fusion

29. 05/11/2006 29 Prof. dr hab. Elżbieta Richter-Wąs Forward jet tagging

30. 05/11/2006 30 Prof. dr hab. Elżbieta Richter-Wąs Example: qqH  qqWW*  qql l

31. 05/11/2006 31 Prof. dr hab. Elżbieta Richter-Wąs Overall SM Higgs discovery potential

32. 05/11/2006 32 Prof. dr hab. Elżbieta Richter-Wąs Overall SM Higgs discovery potential

33. 05/11/2006 33 Prof. dr hab. Elżbieta Richter-Wąs Determination of Higgs boson parameters

34. 05/11/2006 34 Prof. dr hab. Elżbieta Richter-Wąs Higgs mass determination

35. 05/11/2006 35 Prof. dr hab. Elżbieta Richter-Wąs Higgs width determination

36. 05/11/2006 36 Prof. dr hab. Elżbieta Richter-Wąs Determination of couplings

37. 05/11/2006 37 Prof. dr hab. Elżbieta Richter-Wąs Determination of couplings

38. 05/11/2006 38 Prof. dr hab. Elżbieta Richter-Wąs Measurement of partial widths ratios

39. 05/11/2006 39 Prof. dr hab. Elżbieta Richter-Wąs Higgs pair production and self couplings

40. 05/11/2006 40 Prof. dr hab. Elżbieta Richter-Wąs MSSM Higgs sector

41. 05/11/2006 41 Prof. dr hab. Elżbieta Richter-Wąs Production cross-section

42. 05/11/2006 42 Prof. dr hab. Elżbieta Richter-Wąs Higgs decays

43. 05/11/2006 43 Prof. dr hab. Elżbieta Richter-Wąs h  , bb

44. 05/11/2006 44 Prof. dr hab. Elżbieta Richter-Wąs A/H  

45. 05/11/2006 45 Prof. dr hab. Elżbieta Richter-Wąs A/H   : mass reconstruction

46. 05/11/2006 46 Prof. dr hab. Elżbieta Richter-Wąs A/H   : lepton-hadron analysis

47. 05/11/2006 47 Prof. dr hab. Elżbieta Richter-Wąs A/H  

48. 05/11/2006 48 Prof. dr hab. Elżbieta Richter-Wąs Charged Higgs

49. 05/11/2006 49 Prof. dr hab. Elżbieta Richter-Wąs Summary 30fb -1

50. 05/11/2006 50 Prof. dr hab. Elżbieta Richter-Wąs LHC discovery potential for SUSY Higgs bosons

51. 05/11/2006 51 Prof. dr hab. Elżbieta Richter-Wąs What can we do in one year?

52. 05/11/2006 52 Prof. dr hab. Elżbieta Richter-Wąs Conclusions