The first observation of the ttbarH 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 proton-proton collisions at a center-of-mass energy sqrt(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 ttbarH process is measured to be σ(ttbarH)*B_γγ=1.56-0.32+0.34 fb, which is compatible with the standard model prediction of 1.13-0.11+0.08 fb. The fractional contribution of the CP-odd component is measured to be f_CP^Htt=0.00+-0.33.

Measurements of t tbar H Production and the CP Structure of the Yukawa Interaction between the Higgs Boson and Top Quark in the Diphoton Decay Channel

Meridiani P.;Amapane N.;Argiro S.;Bellan R.;Bellora A.;Cappati A.;Costa M.;Covarelli R.;Kiani B.;Migliore E.;Monaco V.;Monteil E.;Obertino M. M.;Pacher L.;Pinna Angioni G. L.;Salvatico R.;Siviero F.;Sola V.;Solano A.;Soldi D.;Shchelina K.;Rumerio P.;Ravera F.;
2020-01-01

Abstract

The first observation of the ttbarH 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 proton-proton collisions at a center-of-mass energy sqrt(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 ttbarH process is measured to be σ(ttbarH)*B_γγ=1.56-0.32+0.34 fb, which is compatible with the standard model prediction of 1.13-0.11+0.08 fb. The fractional contribution of the CP-odd component is measured to be f_CP^Htt=0.00+-0.33.
2020
125
6
061801
061818
Sirunyan A.M.; Tumasyan A.; Adam W.; Ambrogi F.; Bergauer T.; Dragicevic M.; Ero J.; Escalante Del Valle A.; Flechl M.; Fruhwirth R.; Jeitler M.; Kram...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1776593
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