Abstract
Measurements of Higgs boson properties in the H → γγ 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 35.9 fb−1. Allowing the Higgs mass to float, the measurement yields a signal strength relative to the standard model prediction of 1.18− 0.14+ 0.17 = 1.18− 0.11+ 0.12(stat)− 0.07+ 0.09(syst)− 0.06+ 0.07(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.
Highlights
The standard model of particle physics (SM) [1,2,3] has been very successful in explaining the interactions between elementary particles
The analy√sis is based on data collected by the CMS experiment in protonproton collisions at s = 13 TeV during the 2016 LHC running period, corresponding to an integrated luminosity of 35.9 fb−1
During the Run 1 period (2010–2012) of the CERN LHC, with proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, a new particle was discovered by the ATLAS [4] and CMS [5, 6] collaborations
Summary
The standard model of particle physics (SM) [1,2,3] has been very successful in explaining the interactions between elementary particles. The discovery was followed by a comprehensive set of studies of the properties of this new boson in the decay channels and production modes accessible with the LHC Run 1 data set. Measurements of the Higgs boson production rates with respect to the SM prediction (signal strength modifiers) are presented, along with measurements of the coupling modifiers to fermions and bosons, and effective coupling modifiers to photons and gluons, in the so-called κ framework [17]. Improved precision on these parameters constrains possible deviations in the Higgs sector of the SM.
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