Measurements of Higgs boson production and properties in the ZZ decay channel using the CMS detector

Abstract

Measurements of Higgs boson properties using the $\text{H}\to\text{ZZ}\to4\ell$ ($\ell=\text{e},\mu$) decay channel are presented, based on a data sample corresponding to an integrated luminosity of $12.9\,\text{fb}^\text{$-$1}$ of pp collisions at a center-of-mass energy of $13\,\text{TeV}$ collected by the CMS experiment at the LHC during 2016. The observed significance for the standard model Higgs boson is $6.2\sigma$ at a mass of $m_\text{H}=125.09\,\text{GeV}$, where the expected significance is $6.5\sigma$. The signal strength $\mu$, defined as the ratio of the Higgs boson production cross section times branching fraction to four leptons to the standard model expectation, is measured to be $\mu=0.99^{+0.33}_{-0.26}$. Individual strength parameters for four Higgs boson production modes are constrained for the first time using this channel. The Higgs boson mass is measured to be $m_\text{H}=124.50^{+0.48}_{-0.46}\,\text{GeV}$. The model-independent fiducial cross section is measured to be $2.29^{+0.74}_{-0.64}({\rm stat.})^{+0.30}_{-0.23}({\rm sys.})^{+0.01}_{-0.05}({\rm model~dep.})\,\text{fb}$, and differential cross sections as a function of the transverse momentum of the Higgs boson and the number of associated jets are measured.