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Search for doubly charged Higgs bosons in e- μ channel at √s=7TeV at CMS

Search for doubly charged Higgs bosons in e- μ channel at √s=7TeV at CMS. Jongseok Lee, Youngil Choi, Sungeun Lee, Suyong Choi 1 , Sungkyunkwan Univ., 1 Korea Univ. April 23, 2012. Contents. Introduction Samples HLT and Skim Lepton and event selection Signal & background efficiency

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Search for doubly charged Higgs bosons in e- μ channel at √s=7TeV at CMS

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  1. Search for doubly charged Higgs bosons in e-μ channel at √s=7TeV at CMS Jongseok Lee, Youngil Choi, Sungeun Lee, Suyong Choi1, Sungkyunkwan Univ., 1Korea Univ. April 23, 2012

  2. Contents • Introduction • Samples • HLT and Skim • Lepton and event selection • Signal & background efficiency • Limit

  3. Introduction • In models with expanded Higgs sector, one can have Higgs triplets.  Doubly charged Higgs • Pair production : through Drell-Yan process • Decays : • In this analysis, we only consider e-μ decays (Br(H++ l+l+)=1 is assumed, l+l+ = e+e+ or e+μ+ or μ+μ+) in CMS_NOTE2006_081 cross section (hep-ph/9610237)

  4. Samples • Used CMSSW version : 4_4_2 • MC signal samples (√s=7TeV) : 0.5M events of full simulation data → H++H-- to l+l+l-l- → M(H±±) = 130, 150, 170, 200, 300, 400, 500GeV • MC background samples : 50k events of full simulation data → ZZJetsTo4L, WZJetsTo3LNu TTJets, ZJetsToLL, QCD • Data samples : Lint = 4.63 fb-1 calculated by Michael Spira

  5. HLT and skim efficiencies • Used paths : HLT_DoubleMu7 HLT_Ele17_CaloIdL_CaloIsoVL_Ele8_CaloIdL_CaloIsoVL HLT_Mu8_Ele17_CaloIdL HLT_Mu17_Ele8_CaloIdL • Skim conditions : firstpt>15 GeV && secondpt>10 GeV

  6. Lepton & event selection • Electron selection pT>10 GeV, |η|<2.5, |d0|<0.02, sip<4, nchi2<10, charge consistent, eidMedium • Muon selection pT>10 GeV, |η|<2.4, global muon, |d0|<0.02, sip<4, nchi2<10, hits_val>20, nstation>=1 • Preselection : nlep+>=2, nlep->=2, Mll>10 GeV • Event selection - mass dependent cut relative isolation : (IsoPttrack + IsoPtecal + IsoPthcal)/pt < cut value di-lepton pt cut : Max(pT(H++),pT(H--),pT(Z1),pT(Z2)) > cut value

  7. # of primary vertices nlep+>=2, nlep->=2, Mll>10 Before pileup reweighting after pileup reweighting expected # of event expected # of event # of primary vertices # of primary vertices

  8. Electron cut variables (√s=7TeV, Lumi = 4.63 fb-1) nlep+>=2, nlep->=2, Mll>10 expected # of electrons expected # of electrons expected # of electrons GeV mm expected # of electrons expected # of electrons expected # of electrons

  9. Muon cut variables (√s=7TeV, Lumi = 4.63 fb-1) nlep+>=2, nlep->=2, Mll>10 expected # of muons expected # of muons expected # of muons GeV mm expected # of muons expected # of muons expected # of muons

  10. Iso for event selection (mH++=200GeV, √s=7TeV, Lumi = 4.63 fb-1) nlep+>=2, nlep->=2, Mll>10 H++H-- e+e+e-μ- H++H-- e+e+μ-μ- H++H-- e+e+e-e- expected # of event expected # of event expected # of event H++H-- e+μ+μ-μ- H++H--μ+μ+μ-μ- H++H-- e+μ+e-μ- expected # of event expected # of event expected # of event

  11. di-lepton PT for event selection (mH++=200GeV, √s=7TeV, Lumi = 4.63 fb-1) nlep+>=2, nlep->=2, Mll>10, isolation H++H-- e+e+e-μ- H++H-- e+e+μ-μ- H++H-- e+e+e-e- expected # of event expected # of event expected # of event GeV GeV GeV H++H-- e+μ+μ-μ- H++H--μ+μ+μ-μ- H++H-- e+μ+e-μ- expected # of event expected # of event expected # of event GeV GeV GeV

  12. Signal & background efficiency

  13. Mass of H++(m(H++)=200GeV, √s=7TeV, Lumi = 4.63 fb-1) nlep+>=2, nlep->=2, Mll>10, isolation expected # of event expected # of event expected # of event H++H-- e+e+e-μ- H++H-- e+e+μ-μ- H++H-- e+e+e-e- GeV GeV GeV expected # of event expected # of event expected # of event H++H-- e+μ+μ-μ- H++H--μ+μ+μ-μ- H++H-- e+μ+e-μ- GeV GeV GeV

  14. Mass of H++(m(H++)=200GeV, √s=7TeV, Lumi = 4.63 fb-1) nlep+>=2, nlep->=2, Mll>10, isolation, di-lepton pt expected # of event expected # of event expected # of event H++H-- e+e+e-μ- H++H-- e+e+μ-μ- H++H-- e+e+e-e- GeV GeV GeV expected # of event expected # of event expected # of event H++H-- e+μ+μ-μ- H++H--μ+μ+μ-μ- H++H-- e+μ+e-μ- GeV GeV GeV

  15. Exclusion limit nlep+>=2, nlep->=2, isolation, di-lepton pt cut eeee Expected Limit : 327 Observed Limit : 329 eeem Expected Limit : 344 Observed Limit : 344 eemm Expected Limit : 420 Observed Limit : 420 emem Expected Limit : 334 Observed Limit : 336 emmm Expected Limit : 371 Observed Limit : 342 mmmm Expected Limit : 359 Observed Limit : 361

  16. Result nlep>=4, isolation, di-lepton pt cut

  17. backup • Isolation

  18. Isolation • isolation in tracker only : • isolation in tracker+calorimeter : • relative isolation in tracker only : • relative isolation in tracker+calorimeter :

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