Abstract
Differential Higgs boson (H) production cross sections are sensitive probes for physics beyond the standard model. New physics may contribute in the gluon-gluon fusion loop, the dominant Higgs boson production mechanism at the LHC, and manifest itself through deviations from the distributions predicted by the standard model. Combined spectra for the H→γγ, H→ZZ, and H→bb‾ decay channels and the inclusive Higgs boson production cross section are presented, based on proton-proton collision data recorded with the CMS detector at s=13TeV corresponding to an integrated luminosity of 35.9fb−1. The transverse momentum spectrum is used to place limits on the Higgs boson couplings to the top, bottom, and charm quarks, as well as its direct coupling to the gluon field. No significant deviations from the standard model are observed in any differential distribution. The measured total cross section is 61.1±6.0(stat)±3.7(syst)pb, and the precision of the measurement of the differential cross section of the Higgs boson transverse momentum is improved by about 15% with respect to the H→γγ channel alone.
Highlights
The Higgs boson (H), whose existence is predicted by the Brout–Englert–Higgs mechanism [1,2,3], is responsible for electroweak symmetry breaking in the standard model (SM)
When the Higgs boson couplings to quarks and to other bosons are varied with respect to their SM values, distortions of the predicted differential cross section spectra appear, which are pronounced in the transverse momentum distribution
The total cross section for Higgs boson production, based on a combination of the H → γ γ and H → ZZ channels, is measured to be 61.1 ± 6.0 ± 3.7 pb, obtained by applying the treatment described in Section 4 to the inclusive cross section
Summary
The Higgs boson (H), whose existence is predicted by the Brout–Englert–Higgs mechanism [1,2,3], is responsible for electroweak symmetry breaking in the standard model (SM). Studie√s from the ATLAS Collaboration [16, 17], using data collected at s = 13 TeV corresponding to an integrated luminosity of 36.1 fb−1 , yield an observed upper limit on the H → J/ψ branching fraction of 3.5 × 10−4 at 95% CL that is an improvement of about a factor two with respect to the result obtained in Ref. [14], and an observed upper limit on the product of the production cross section and branching fraction σ (pp → ZH)B(H → cc) of 110 times the SM value at 95% CL Both the ATLAS and CMS Collaborations have reported meas√urements of differential Higgs boson production cross sections at s = 8 and 13 TeV [18,19,20,21,22,23,24,25,26,27,28]. We assume a Higgs boson mass of 125.09 GeV for all measurements in this paper, based on the combined ATLAS and CMS measurement using proton-proton collision data collected in 2011 and 2012 [8]
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