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Search for the standard model Higgs boson in the decay channel H→ZZ→4l in pp collisions at √s=7TeV

par Chatrchyan, Serguei;Clerbaux, Barbara ;De Lentdecker, Gilles ;Gay, Arnaud ;Hreus, Tomas ;Leonard, Alexandre ;Marage, Pierre ;Thomas, Laurent ;Vander Velde, Catherine ;Vanlaer, Pascal ;Wang, Jian ;Charaf, Othman ;Dero, Vincent ;Hammad, Grégory ;Wickens, John H. ; [et al.]
Référence Physical review letters, 108, 11, 111804
Publication Publié, 2012

Article révisé par les pairs

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Résumé :

A search for a Higgs boson in the four-lepton decay channel H→ZZ, with each Z boson decaying to an electron or muon pair, is reported. The search covers Higgs boson mass hypotheses in the range of 110100GeV (with 13 below 160GeV), while 67.1±6.0 (9.5±1.3) events are expected from background. The four-lepton mass distribution is consistent with the expectation of standard model background production of ZZ pairs. Upper limits at 95% confidence level exclude the standard model Higgs boson in the ranges of 134-158GeV, 180-305GeV, and 340-465GeV. Small excesses of events are observed around masses of 119, 126, and 320GeV, making the observed limits weaker than expected in the absence of a signal.