Abstract
We present the constraints set by the CMS collaboration on the total width of the recently discovered Higgs boson, ΓH, using its relative on-shell and off-shell production and decay rates to a pair of Z bosons. The analysis is based on the data collected by the CMS experiment at the LHC in 2011 and 2012, corresponding to integrated luminosities of 5.1 fb−1 at a centre-of-mass energy s=7 TeV and 19.7 fb−1 at s=8 TeV. An upper limit on the Higgs boson width of ΓH<22 MeV at a 95% confidence level was set using the ZZ→4ℓ and 2l2ν final states. This bound corresponds to 5.4 times the expected value in the standard model at the measured mass of mH=125.6 GeV.
Highlights
Both the CMS and ATLAS collaborations reported the discovery of a new boson of mass around 125 GeV [1, 2, 3]
The observed signal was found consistent with a single narrow resonance and a direct upper limit of 3.4 GeV at a 95% confidence level (CL) on the new boson width (ΓH) has been reported by the CMS experiment
A new technique to constrain the Higgs boson width was recently proposed [8]. It relies on the off-shell Higgs boson production and decay to ZZ away from the resonance
Summary
Both the CMS and ATLAS collaborations reported the discovery of a new boson of mass (mH) around 125 GeV [1, 2, 3]. The observed signal was found consistent with a single narrow resonance and a direct upper limit of 3.4 GeV at a 95% confidence level (CL) on the new boson width (ΓH) has been reported by the CMS experiment. A new technique to constrain the Higgs boson width was recently proposed [8] It relies on the off-shell Higgs boson production and decay to ZZ away from the resonance. In the rest of this document we focus on summarizing the analyses of the off-shell Higgs boson production performed by CMS [12] in the ZZ → 4 and ZZ → 2l2ν final states. The study of the on-shell Higgs boson production, performed in the ZZ → 4 , will not described in this proceeding since it is identical to what is reported in Refs. The study of the on-shell Higgs boson production, performed in the ZZ → 4 , will not described in this proceeding since it is identical to what is reported in Refs. [1, 2, 3]
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