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

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???) is presented, with a significance of 6.6 standard deviations (?). 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 3.2?. 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 t¯tH process is measured to be ?t¯tHB??=1.56+0.34?0.32?fb, which is compatible with the standard model prediction of 1.13+0.08?0.11?fb. The fractional contribution of the CP-odd component is measured to be fHttCP=0.00±0.33.

 Fuente: Phys. Rev. Lett. 125, 061801 (2020)

 Editorial: American Physical Society

 Fecha de publicación: 01/08/2020

 Nº de páginas: 18

 Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevLett.125.061801

 ISSN: 0031-9007,1079-7114

 Url de la publicación: https://doi.org/10.1103/PhysRevLett.125.061801