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Measurement of the associated production of a Higgs boson and a pair of top-antitop quarks with the Higgs boson decaying to two photons in proton-proton collisions at s=13 TeV\sqrt{s}=13~\mathrm{TeV}

Collaboration
2018
Report number:
  • CMS-PAS-HIG-18-018
Experiments:
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Abstract:
This document reports the measurement of the rate of the associated production of a Higgs boson and a pair of top-antitop quarks (ttˉ\bar{\text{t}}H), with the Higgs boson decaying into a pair of photons. Events with two photons are selected from a sample of proton-proton collisions at a center-of-mass energy s=13 TeV\sqrt{s}=13~\mathrm{TeV} collected by the CMS detector at the LHC in 2017, corresponding to an integrated luminosity of 41.5 fb−141.5~\mathrm{fb}^{-1}. The ttˉ\bar{\text{t}}H production is identified by requiring the presence of top quark decay products in the final state. The measured cross section, normalized to the standard model prediction, is 1.3−0.5+0.7^{+0.7}_{-0.5}. The combination with the published result using 35.9 fb−135.9~\mathrm{fb}^{-1} of data recorded in 2016 at a center-of-mass energy s=13 TeV\sqrt{s}=13~\mathrm{TeV} is also reported. The combined best fit cross section, normalized to the standard model prediction, is found to be 1.7−0.5+0.6^{+0.6}_{-0.5}. All results are found in agreement with the standard model expectation.
Note:
  • Preliminary results
  • Data
  • p p: colliding beams
  • top: pair production
  • Higgs particle: associated production
  • Higgs particle: radiative decay
  • photon: pair production
  • p p: scattering
  • channel cross section: measured
  • cross section: ratio
  • final state: ((n)jet 2photon)
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