Measurement of the Higgs boson mass and width using the four leptons final state

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 $138~\mathrm{fb}^{-1}$ at a center-of-mass energy of $13~\mathrm{TeV}$. 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 $\mathrm{m}_\mathrm{H} = 125.08 \pm 0.12~\mathrm{GeV}$ and an upper limit on the width $\Gamma_\mathrm{H} < 60~\mathrm{MeV}$ 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 $2.9^{+2.3}_{-1.7}~\mathrm{MeV}$, in agreement with the standard model prediction of $4.1~\mathrm{MeV}$. The strength of the off-shell Higgs boson production is also reported.