CMS-PAS-HIG-19-001

CMS-PAS-HIG-19-001
Measurements of properties of the Higgs boson in the four-lepton final state in proton-proton collisions at $\sqrt{s}= $ 13 TeV
CMS Collaboration
March 2019

Abstract: Properties of the Higgs (H) boson are measured in the $\mathrm{H}\rightarrow{\rm Z}{\rm Z}\rightarrow4\ell$ ($\ell=$ e, $\mu$) decay channel. The full data sample of proton-proton collisions at a center-of-mass energy of 13 TeV is used, corresponding to an integrated luminosity of 137.1 fb$^{-1}$ recorded in 2016, 2017, and 2018 by the CMS detector at the LHC. The signal-strength modifier $\mu$, defined as the ratio of the H boson rate in the 4$\ell$ channel to the Standard Model (SM) expectation, is measured to be $\mu=$ 0.94$^{+0.07}_{-0.07}$(stat.)$^{+0.08}_{-0.07}$(syst.) with the H boson mass profiled in the fit. The signal-strength modifiers for different H boson production modes are also constrained. Measurements of the simplified template cross sections, designed to quantify the different H boson production processes in specific regions of phase space, are reported. The cross section for the production of the $\mathrm{H}\rightarrow4\ell$ in a fiducial region closely matching the experimental selection of the leptons is measured to be $\sigma_{{\rm fid.}}= $ 2.73$^{+0.23}_{-0.22}$(stat.)$^{+0.24}_{-0.19}$(syst.) fb at $m_{\rm H} = $ 125.09 GeV, compared to a SM prediction of 2.76 $\pm$ 0.14 fb. Differential cross sections as a function of the $p_{\rm T}$ and rapidity of the H boson, the number of associated jets, and the $p_{\rm T}$ of the leading associated jet are determined. All results are found to be compatible with the SM predictions, within the measurements precision.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, EPJC 81 (2021) 488. The superseded preliminary plots can be found here.

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