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Search for doubly charged Higgs bosons in e- μ channel at CMS

Search for doubly charged Higgs bosons in e- μ channel at CMS. Feb. 23, 2013 Jongseok Lee (Sungkyunkwan University). Contents. 7TeV Samples Lepton cut variables Data driven background estimation Comparison with Mario Systematic uncertainties Effect of tau 8TeV analysis

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Search for doubly charged Higgs bosons in e- μ channel at CMS

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  1. Search for doubly charged Higgs bosons ine-μ channel at CMS Feb. 23, 2013 Jongseok Lee (Sungkyunkwan University)

  2. Contents • 7TeV Samples • Lepton cut variables • Data driven background estimation • Comparison with Mario • Systematic uncertainties • Effect of tau • 8TeV analysis • Summary and Plan

  3. Samples • Used CMSSW version : 4_4_2 • MC signal samples (√s=7TeV) : full simulation data → H++H-- to l+l+l-l- → M(H±±) = 150, 170, 200, 250, 300, 400, 500GeV • MC background samples : full simulation data → ZZJetsTo4L, WZJetsTo3LNu TTTo2L2Nu2B, DYJetsToLL • Data samples : 2011 data, Lint(μμ)= 4.75 fb-1 , Lint(ee)= 4.98 fb-1 , Lint (eμ)= 4.98 fb-1 calculated by Michael Spira

  4. Mμμ nm>=2, pt>10, |η|<2.4, global, good, mu_hits_val>20, mu_nstation>0, relIso<0.2, 60<Mμμ<120 lumi : 4.983 fb-1 cross section of DY : 3048 fb lumi : 4.753 fb-1 cross section of DY : 3048 fb Standard model cross sections for CMS at 7TeV : https://twiki.cern.ch/twiki/bin/viewauth/CMS/StandardModelCrossSections lumi : 4.753 fb-1 cross section of DY for 60<Mll<120 : 2916 fb

  5. Muon cut variables nm>=2, pt>10, |η|<2.4, global, good, nhits_val>20, nsation>=1, relIso<0.2, 60<Mμμ<120 7TeV, 4.753 fb-1 7TeV, 4.753 fb-1 7TeV, 4.753 fb-1 7TeV, 4.753 fb-1 7TeV, 4.753 fb-1 7TeV, 4.753 fb-1

  6. Mee ne>=2, pt>10, |η|<2.5, charge consistent, eidLoose, relIso<0.2, 60<Mμμ<120 lumi : 4.983 fb-1 cross section of DY : 3048 fb lumi : 4.983 fb-1 cross section of DY for 60<Mll<120 : 2916 fb Standard model cross sections for CMS at 7TeV : https://twiki.cern.ch/twiki/bin/viewauth/CMS/StandardModelCrossSections

  7. Electron cut variables ne>=2, pt>10, |η|<2.5, eidLoose, relIso<0.2 7TeV, 4.983 fb-1 7TeV, 4.983 fb-1 7TeV, 4.983 fb-1 7TeV, 4.983 fb-1 7TeV, 4.983 fb-1 7TeV, 4.983 fb-1

  8. Sideband method

  9. # of events at 7TeV & 4.753fb-1 nlep+>=2, nlep->=2, relIso<0.5, m(H±±)>10, in signal region (5σ) ± α error ± relative error ± statistical error

  10. # of events at 7TeV & 4.983fb-1 nlep+>=2, nlep->=2, relIso<0.5, m(H±±)>10, in signal region (5σ) ± α error ± relative error ± statistical error

  11. # of events at 7TeV & 4.983fb-1 nlep+>=2, nlep->=2, relIso<0.5, m(H±±)>10, in signal region (5σ) ± α error ± relative error ± statistical error

  12. ABCD method Background is independent for relIso & m4 : The estimated number of background events in A : This can be done completely without MC information -> Data driven background estimation M4l>200 M4l<200 A B D C relIso<0.2 relIso>0.2 signal backgound A B C D : regions nA nB nC nD : event counts

  13. # of events at 7TeV & 4.983fb-1 nlep+>=2, nlep->=2, m(H±±)>10 ± statistical error

  14. # of events at 7TeV & 4.983fb-1 nlep+>=2, nlep->=2, m(H±±)>10 ± statistical error

  15. # of events at 7TeV & 4.983fb-1 nlep+>=2, nlep->=2, m(H±±)>10 ± statistical error

  16. Comparison with Mario for 4μ channelat7TeV & 4.753fb-1

  17. 4μ & event selection(case 1) • Muon selection pT>10 GeV, |η|<2.4, global muon, good muon, hits_val>20, nstation>=1 • Preselection : nlep+>=2, nlep->=2, Mll>10 GeV • Event selection - mass dependent cut - quad-lepton mass : M4l > cut value - relative isolation : (IsoPttrack + IsoPtcalorimeter)/pt < cut value - minimum one event for backgrounds

  18. 4μ & event selection(case 2) • Muon selection pT>10 GeV, |η|<2.4, global muon, good muon, hits_val>20, nstation>=1 • Preselection : nlep+>=2, nlep->=2, pT,1st>20 GeV, pT,2nd>10 GeV, Mll>12 GeV, relIsoworst + relIsonext to worst < 0.35 • Event selection - mass dependent cut - sumpt : ∑pT > 0.6mΦ + 130GeV - mass window : [0.9mΦ ; 1.1mΦ] - minimum one event for backgrounds

  19. # of expected events preselection, M4l, relIso (case 1) preselection, sumpt, mass window (case 2)

  20. Exclusion limit for 4μ at 7TeV preselection, M4l, relIso (case 1) preselection, sumpt, mass window (case 2) Expected Limit : 375 GeV Observed Limit : 399 GeV Expected Limit : 385 GeV Observed Limit : 399 GeV

  21. 4μ & event selectionby Mario (case 3) • Muon selection pT>5 GeV, |η|<2.4, global muon, tight muon id • Preselection : pT,1st>20 GeV, pT,2nd>10 GeV, Mll>12 GeV, relIsoworst + relIsonext to worst < 0.35, sip<4 • Event selection - mass dependent cut - sumpt : ∑pT > 0.6mΦ + 130GeV - mass window : [0.9mΦ ; 1.1mΦ] - minimum one event for backgrounds

  22. # of expected events preselection, M4l, relIso (case 1) Mario’s result at 7TeV & 4.93fb-1 (case 3)

  23. Exclusion limit for 4μ at 7TeV preselection, M4l, relIso (case 1) Mario’s result at 7TeV & 4.93fb-1 (case 3) Expected Limit : 385 GeV Observed Limit : 399 GeV Result for pair production only : 395GeV

  24. # of expected events preselection, sumpt, mass window (case 2) Mario’s result at 7TeV & 4.93fb-1 (case 3)

  25. Exclusion limit for 4μ at 7TeV preselection, sumpt, mass window (case 2) Mario’s result at 7TeV & 4.63fb-1 (case 3) Expected Limit : 375 GeV Observed Limit : 399 GeV Result for pair production only : 395GeV

  26. Comparison with Mario for 4e channelat7TeV & 4.983fb-1

  27. 4e & event selection (case 1) • Electron selection pT>10 GeV, |η|<2.5, |dxy|<0.02, eidLoose • Preselection : nlep+>=2, nlep->=2, Mll>10 GeV • Event selection - mass dependent cut - quad-lepton mass : M4l > cut value - relative isolation : (IsoPttrack + IsoPtcalorimeter)/pt < cut value - minimum one event for backgrounds

  28. 4e & event selection(case 2) • Electron selection pT>10 GeV, |η|<2.5, |dxy|<0.02, eidLoose • Preselection :nlep+>=2, nlep->=2, pT,1st>20 GeV, pT,2nd>10 GeV, Mll>12 GeV, relIsoworst + relIsonext to worst < 0.35 • Event selection - mass dependent cut - sumpt : ∑pT > 0.6mΦ + 130GeV - mass window : [0.9mΦ ; 1.1mΦ] - minimum one event for backgrounds

  29. # of expected events preselection, M4l, relIso at 7TeV & 4.983fb-1 (case 1) preselection, sumpt, mass window at 7TeV & 4.983fb-1 (case 2)

  30. Exclusion limit preselection, M4l, relIso at 7TeV & 4.983fb-1 (case 1) preselection, sumpt, mass window at 7TeV & 4.983fb-1 (case 2) Expected Limit : 341 GeV Observed Limit : 356 GeV Expected Limit : 346 GeV Observed Limit : 364 GeV

  31. 4e & event selectionby Mario (case 3) • Electron selection pT>15 GeV, |η|<2.5, CiCid, ipT <2mm • Preselection : pT,1st>20 GeV, pT,2nd>10 GeV, Mll>12 GeV, relIsoworst + relIsonext to worst < 0.35, sip<4 • Event selection - mass dependent cut - sumpt : ∑pT > 0.6mΦ + 130GeV - mass window : [0.9mΦ ; 1.1mΦ] - minimum one event for backgrounds

  32. # of expected events preselection, M4l, relIso at 7TeV & 4.983fb-1 (case 1) Mario’s result at 7TeV & 4.93fb-1 (case 3)

  33. Exclusion limit for 4e at 7TeV preselection, M4l, relIso at 7TeV & 4.983fb-1 (case 1) Mario’s result at 7TeV & 4.93fb-1 (case 3) Expected Limit : 346 GeV Observed Limit : 364 GeV Result for pair production only : 384GeV

  34. # of expected events preselection, sumpt, mass window at 7TeV & 4.983fb-1 (case 2) Mario’s result at 7TeV & 4.93fb-1 (case 3)

  35. Exclusion limit for 4e at 7TeV preselection, sumpt, mass window at 7TeV & 4.983fb-1 (case 2) Mario’s result at 7TeV & 4.93fb-1 (case 3) Expected Limit : 341 GeV Observed Limit : 356 GeV Result for pair production only : 384GeV

  36. Comparison with Mario for eμeμ channelat7TeV & 4.983fb-1

  37. # of expected events preselection, M4l, relIso at 7TeV & 4.983fb-1 (case 1) preselection, sumpt, mass window at 7TeV & 4.983fb-1 (case 2)

  38. Exclusion limit preselection, M4l, relIso at 7TeV & 4.983fb-1 (case 1) preselection, sumpt, mass window at 7TeV & 4.983fb-1 (case 2) Expected Limit : 363 GeV Observed Limit : 381 GeV Expected Limit : 370 GeV Observed Limit : 393 GeV

  39. # of expected events preselection, M4l, relIso at 7TeV & 4.983fb-1 (case 1) Mario’s result at 7TeV & 4.93fb-1 (case 3)

  40. Exclusion limit preselection, M4l, relIso at 7TeV & 4.983fb-1 (case 1) Mario’s result at 7TeV & 4.93fb-1 (case 3) Expected Limit : 370 GeV Observed Limit : 393 GeV Result for pair production only : 391GeV

  41. # of expected events preselection, sumpt, mass window at 7TeV & 4.983fb-1 (case 2) Mario’s result at 7TeV & 4.93fb-1 (case 3)

  42. Exclusion limit preselection, sumpt, mass window at 7TeV & 4.983fb-1 (case 2) Mario’s result at 7TeV & 4.93fb-1 (case 3) Expected Limit : 363 GeV Observed Limit : 381 GeV Result for pair production only : 391GeV

  43. Systematic uncertainties • Trigger and primary vertex finding : 1.5% • Signal cross section : 10~15% • Luminosity (for signal only) : 4.5%

  44. Effect of tau

  45. # ofevents VS channel(m200) nlep+>=2, nlep->=2 No cut Gen2 channels are separated by gen leptons matched 4 final reco leptons. nlep+>=2, nlep->=2 nlep+>=2, nlep->=2, |mp-mn|/(mp+mn)<0.1

  46. # ofevents VS channel(ZZJetsTo4L) nlep+>=2, nlep->=2 Gen2 channels are separated by gen leptons matched 4 final reco leptons. nlep+>=2, nlep->=2, |mp-mn|/(mp+mn)<0.1 nlep+>=2, nlep->=2

  47. # ofevents VS channel(TTTo2L2Nu2B) nlep+>=2, nlep->=2 Gen2 channels are separated by gen leptons matched 4 final reco leptons. nlep+>=2, nlep->=2, |mp-mn|/(mp+mn)<0.1 nlep+>=2, nlep->=2

  48. Cut variables(ZZJetsTo4L) nlep+>=2, nlep->=2 recoch(eeee) && gen2ch(eeee) recoch(eeee) && gen2ch(etet) recoch(eeee) && gen2ch(eeee) recoch(eeee) && gen2ch(etet)

  49. Cut variables(m200) nlep+>=2, nlep->=2 recoch(eeee) && (gen2ch(eeet)||gen2ch(eett) ||gen2ch(etet)||gen2ch(ettt) ||gen2ch(tttt)) recoch(eeee) && gen2ch(eeee) recoch(eeee) && (gen2ch(eeet)||gen2ch(eett) ||gen2ch(etet)||gen2ch(ettt) ||gen2ch(tttt)) recoch(eeee) && gen2ch(eeee)

  50. Cut efficiency

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