We discuss the constraints on the total Higgs boson width using off-shell production and decay to four leptons, 4ℓ, or two leptons plus two neutrinos, 2ℓ2ν. The analysis is based on the data collected in 2012 by the CMS experiment, corresponding to an integrated luminosity L=19.7fb−1 at a center-of-mass energy √s=8TeV. 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_H<4.2×Γ_SMH at the 95% confidence level, assuming Γ_SMH=4.15MeV. This result considerably improves over previous experimental constraints from the measurement near the resonance peak.
