Speaker
Ian James Anderson
(Johns Hopkins University (US))
Description
We constrain the total Higgs boson width using off-shell production and decay to four leptons, 4ℓ, or two leptons plus two neutrinos, 2ℓ2ν, with ℓ=e,μ. The analysis is based on the data collected in 2011 and 2012 by the CMS experiment at the LHC, corresponding to integrated luminosities of ${\cal L}=19.7fb^{−1}$ and ${\cal L}=5.1 fb^{-1}$ at center-of-mass energies of √s=8 TeV and √s=7 TeV respectively. The 4ℓ analysis uses the ZZ invariant mass distribution as well as a matrix element likelihood discriminant to separate the ZZ components originating from gluon- and quark-initiated processes. The 2ℓ2ν analysis relies on the transverse mass or missing transverse energy distributions in jet categories. An unbinned maximum-likelihood fit of the above distributions, combined with the 4ℓ measurement near the resonance peak, leads to an upper limit on the Higgs boson width of Γ<17 MeV at the 95% confidence level. This result considerably improves over previous experimental constraints from the measurement near the resonance peak.
Author
Ian James Anderson
(Johns Hopkins University (US))
