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
Benedum Hall G28 (University of Pittsburgh)

Benedum Hall G28

University of Pittsburgh


Ian James Anderson (Johns Hopkins University (US))


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