New constraints on Higgs boson total width using the ZZ decay channel in CMS
Roberto Covarelli
University of Rochester
Lundi 12/05/2014, 11:00
Bat 141, salle André Berthelot Masque obligatoire , CEA Paris-Saclay

Using LHC Run1 data, the CMS experiment has set tight constraints on the total Higgs boson width, using off-shell production and decay to ZZ to four leptons, 4l, or two leptons plus two neutrinos, 2l2ν with l = e,μ. The study is based on the width-independent enhancement at large ZZ invariant mass expected for a SM Higgs boson. The 4l analysis makes use of the ZZ invariant mass distribution and of a matrix element likelihood discriminant to separate the ZZ components originating from gluon- and quark-initiated processes, while the 2l2ν analysis relies on the transverse mass distribution in jet categories.


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