The first observation of the t¯tH process in a single Higgs boson decay channel with the full reconstruction of the final state (H → γγ) is presented, with a significance of 6.6 standard deviations (σ). The CP structure of Higgs boson couplings to fermions is measured, resulting in an exclusion of the pure CP-odd structure of the top Yukawa coupling at 3.2σ. The measurements are based on a sample of protonproton collisions at a center-of-mass energy √s=13 TeV collected by the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb−1. The cross section times branching fraction of the t¯tH process is measured to be σt¯tH Bγγ=1.56+0.34−0.32 fb, which is compatible with the standard model prediction of 1.13þ0.08 −0.11 fb. The fractional contribution of the CP-odd component is measured to be fHtt CP ¼ 0.00 0.33. fHtt CP=0.00±0.33.
(2020). Measurements of tt¯H Production and the CP Structure of the Yukawa Interaction between the Higgs Boson and Top Quark in the Diphoton Decay Channel [journal article - articolo]. In PHYSICAL REVIEW LETTERS. Retrieved from http://hdl.handle.net/10446/164639
Measurements of tt¯H Production and the CP Structure of the Yukawa Interaction between the Higgs Boson and Top Quark in the Diphoton Decay Channel
Re, V.;Vai, I.;
2020-01-01
Abstract
The first observation of the t¯tH process in a single Higgs boson decay channel with the full reconstruction of the final state (H → γγ) is presented, with a significance of 6.6 standard deviations (σ). The CP structure of Higgs boson couplings to fermions is measured, resulting in an exclusion of the pure CP-odd structure of the top Yukawa coupling at 3.2σ. The measurements are based on a sample of protonproton collisions at a center-of-mass energy √s=13 TeV collected by the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb−1. The cross section times branching fraction of the t¯tH process is measured to be σt¯tH Bγγ=1.56+0.34−0.32 fb, which is compatible with the standard model prediction of 1.13þ0.08 −0.11 fb. The fractional contribution of the CP-odd component is measured to be fHtt CP ¼ 0.00 0.33. fHtt CP=0.00±0.33.File | Dimensione del file | Formato | |
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