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Compact Muon Solenoid
LHC, CERN

CMS-PAS-HIG-13-002
Properties of the Higgs-like boson in the decay H to ZZ to 4l in pp collisions at sqrt s =7 and 8 TeV
Abstract: The properties of the new boson with the mass around 125 GeV are reported. The boson is observed in the search for the standard model Higgs boson in the mass range < m_H < 1000GeVintheH\rightarrowZZdecaychannel.ThesearchconsidersfinalstateswherebothZsdecaytoelectron,muon,ortauleptonpairs.TheanalysisusesppcollisiondatarecordedbytheCMSdetectorattheLHC,correspondingtointegratedluminositiesof5.1{\rm fb}^{-1}at\sqrt{s} = 7TeVand19.6{\rm fb}^{-1}at\sqrt{s}= 8TeV.Itmakesuseofthemeasuredfourleptonmass,themassuncertainty,kinematicdiscriminants,andinformationsensitivetotheproductionmechanism,suchasassociateddijetcharacteristicsandtransversemomentumofthefourleptonsystem.Thebosonisobservedinchannelswithelectronandmuonpairswithalocalsignificanceabovetheexpectedbackgroundof6.7standarddeviationswiththemass.8±0.5 (stat.) ±0.2 (syst.)~GeV. The signal strength μ, relative to the expectation for the standard model Higgs boson, is measured to be μ=0.91+0.300.24. The signal strength modifiers associated with vector bosons and fermions in production are measured to beμV=1.0+2.42.3 and μF=0.9+0.50.4, thus consistent with the standard model expectations. The spin-parity of the boson is studied and the pure scalar hypothesis is found to be consistent with the observation when compared to six other spin-parity hypotheses. The data disfavour the pure pseudoscalar hypothesis ^-witha\mathrm{CL_s}valueof0.16%,anddisfavourthepurespin2hypothesisofanarrowresonancewiththeminimalcouplingstothevectorbosonswitha\mathrm{CL_s}$ value of 1.5\%. The spin-1 hypotheses are disfavoured with an even higher confidence. No other significant standard model Higgs-like excess is found in the search and upper limits at 95\% confidence level exclude the range 130--827~GeV.
CMS Publications
Compact Muon Solenoid
LHC, CERN