CMS-PAS-HIG-21-019

CMS-PAS-HIG-21-019
Measurement of the Higgs boson mass and width using the four leptons final state
CMS Collaboration
20 September 2023

Abstract: A measurement of the Higgs boson mass and width using the decays to two Z bosons is presented, using the proton-proton data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 138 fb $^{-1}$ at a center-of-mass energy of 13 TeV. The on-shell production of the Higgs boson with the decay $\mathrm{H} \to \mathrm{Z} \mathrm{Z}^* \to 4\ell$ is used to constrain its mass and width, which yields to the most precise single measurement of the mass to date $\mathrm{m}_\mathrm{H} =$ 125.08 $\pm$ 0.12 GeV and an upper limit on the width $\Gamma_\mathrm{H} <$ 60 MeV at 68% confidence level. A combination of the on-shell and off-shell production of the Higgs boson is used to constrain its width, leading to the observed measurement on the width 2.9 $^{+2.3}_{-1.7}$ MeV, in agreement with the standard model prediction of 4.1 MeV. The strength of the off-shell Higgs boson production is also reported.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PRD. The superseded preliminary plots can be found here.

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