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
Author(s)
The CMS Collaboration; Abercrombie, Daniel Robert; Allen, Branden; Bi, Ran; Brandt, Stephanie Akemi; Busza, Wit; Cali, Ivan Amos; D'Alfonso, Mariarosaria; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Harris, Philip Coleman; Hsu, David; Hu, Miao; Klute, Markus; Kovalskyi, Dmytro; Lee, Y.-J.; Luckey Jr, P David; Maier, Benedikt; Marini, Andrea Carlo; McGinn, Christopher Francis; Mironov, Camelia Maria; Narayanan, S.; Niu, Xinmei; Paus, Christoph M. E.; Rankin, Dylan S.; Roland, Christof E; Roland, Gunther M; Shi, Z.; Stephans, George S. F.; Sumorok, Konstanty C; Tatar, Kaya; Velicanu, Dragos Alexandru; Wang, J.; Wang, T. W.; Wyslouch, Boleslaw; ... Show more Show less![Thumbnail](/bitstream/handle/1721.1/133560.2/PhysRevLett.125.061801.pdf.jpg?sequence=2&isAllowed=y)
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© 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.
Date issued
2020Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. Department of Aeronautics and AstronauticsJournal
Physical Review Letters
Publisher
American Physical Society (APS)