A search for a standard model Higgs boson decaying into a pair of ฯ„ 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 ฯ„ lepton decays hadronically or leptonically to an electron or a muon, leading to six different final states for the ฯ„-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 โ†’ ฯ„ฯ„ signal cross section times branching fraction for mH = 125 GeV is 0.78ยฑ0.27 times the standard model expectation. These observations constitute evidence for the 125 GeV Higgs boson decaying to a pair of ฯ„ leptons.

Evidence for the 125 GeV Higgs boson decaying to a pair of tau leptons

BISELLO, DARIO;BRANCA, ANTONIO;CARLIN, ROBERTO;GALANTI, MARIO;GASPARINI, FABRIZIO;GASPARINI, UGO;GIUBILATO, PIERO;GOZZELINO, ANDREA;MARGONI, MARTINO;MENEGUZZO, ANNA TERESA;NESPOLO, MASSIMO;PAZZINI, JACOPO;POZZOBON, NICOLA;RONCHESE, PAOLO;SIMONETTO, FRANCO;TOSI, MIA;A. Triossi;VANINI, SARA;ZOTTO, PIERLUIGI;ZUCCHETTA, ALBERTO;ZUMERLE, GIANNI;M. Grassi;ROSSIN, ROBERTO;A. Gaz;M. Zanetti;