A search for a standard model Higgs boson decaying into a pair of Ï leptons is performed using events recorded by the CMS experiment at the LHC in 2011 and 2012. The dataset corresponds to an integrated luminosity of 4.9 fb<sup>-1</sup> at a centre-of-mass energy of 7TeV and 19.7fb<sup>-1</sup> at 8TeV. Each Ï lepton decays hadronically or leptonically to an electron or a muon, leading to six different final states for the Ï-lepton pair, all considered in this analysis. An excess of events is observed over the expected background contributions, with a local significance larger than 3 standard deviations for mH values between 115 and 130 GeV. The best fit of the observed H â ÏÏ signal cross section times branching fraction for m<inf>H</inf> = 125 GeV is 0.78±0.27 times the standard model expectation. These observations constitute evidence for the 125 GeV Higgs boson decaying to a pair of Ï leptons.
Evidence for the 125 gev higgs boson decaying to a pair of Ï leptons
ALBERGO, Sebastiano Francesco;CAPPELLO, GIGI;CHIORBOLI, MASSIMILIANO;COSTA, Salvatore;GIORDANO, FERDINANDO;POTENZA, Renato Carlo;TRICOMI, Alessia Rita;TUVE', Cristina Natalina;
2014-01-01
Abstract
A search for a standard model Higgs boson decaying into a pair of Ï leptons is performed using events recorded by the CMS experiment at the LHC in 2011 and 2012. The dataset corresponds to an integrated luminosity of 4.9 fb-1 at a centre-of-mass energy of 7TeV and 19.7fb-1 at 8TeV. Each Ï lepton decays hadronically or leptonically to an electron or a muon, leading to six different final states for the Ï-lepton pair, all considered in this analysis. An excess of events is observed over the expected background contributions, with a local significance larger than 3 standard deviations for mH values between 115 and 130 GeV. The best fit of the observed H â ÏÏ signal cross section times branching fraction for mI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.