Measurements of Higgs boson properties in the diphoton decay channel in proton-proton collisions at $\sqrt{s} =$ 13 TeV

TL;DR

This paper reports precise measurements of the Higgs boson properties in the diphoton decay channel using CMS data at 13 TeV, confirming consistency with the Standard Model within uncertainties.

Contribution

It provides the first detailed measurement of Higgs production mechanisms and couplings in the diphoton channel at 13 TeV with 35.6 fb$^{-1}$ of data.

Findings

Measured signal strength relative to SM: 1.18$^{+0.17}_{-0.14}$

Confirmed Higgs couplings to bosons and fermions are consistent with SM

Analyzed different production mechanisms and effective couplings

Abstract

Measurements of Higgs boson properties in the H $\to\gamma\gamma$ decay channel are reported. The analysis is based on data collected by the CMS experiment in proton-proton collisions at $\sqrt{s} =$ 13 TeV during the 2016 LHC running period, corresponding to an integrated luminosity of 35.6 fb$^{-1}$. Allowing the Higgs mass to float, the measurement yields a signal strength relative to the standard model prediction of 1.18 $^{+0.17}_{-0.14} =$ 1.18 $^{+0.12}_{-0.11}$ (stat) $^{+0.09}_{-0.07}$ (syst) $^{+0.07}_{-0.06}$ (theo), which is largely insensitive to the exact Higgs mass around 125 GeV. Signal strengths associated with the different Higgs boson production mechanisms, couplings to bosons and fermions, and effective couplings to photons and gluons are also measured.