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Measurements of t t ¯ H Production and the C P Structure of the Yukawa Interaction between the Higgs Boson and Top Quark in the Diphoton Decay Channel
Name
PhysRevLett.125.061801.pdf
Description
Published version
Size
1.57 MB
Format
Adobe PDF
Checksum (MD5)
206eb66ef9547308fa4cd275dfd79427
Date Issued
2020
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2020 CERN. The first observation of the tt¯H 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 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 tt¯H process is measured to be σtt¯HBγγ=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 fCPHtt=0.00±0.33.
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
10.1103/PHYSREVLETT.125.061801
