5-7 May 2014
University of Pittsburgh
US/Eastern timezone

Constraint on Higgs boson total width using off-shell production in the ZZ decay

5 May 2014, 17:00
15m
Benedum Hall G28 (University of Pittsburgh)

Benedum Hall G28

University of Pittsburgh

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.

Primary author

Ian James Anderson (Johns Hopkins University (US))

Presentation Materials