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

2020/03/31 by A. M. Sirunyan, CMS Collaboration, A. Tumasyan +98 · 3 citations
Physics and Astronomy · #Astrophysics #Branching fraction #Dark Matter and Cosmic Phenomena #Higgs boson #High-Energy Particle Collisions Research #Luminosity #Materials science #Muon #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Standard Model (mathematical formulation) #Yukawa potential #hep-ex

paper · pdf · doi:10.1103/physrevlett.125.061801

published as Phys. Rev. Lett. 125, 061801 (2020) · Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-19-013 (CMS Public Pages)

openalex created_date 2020/04/24 · openalex publication_date 2020/08/05 · arxiv created 2020/08/10 · arxiv updated 2020/08/12 · openalex updated_date 2026/08/06

Abstract

The first observation of the ttH process in a single Higgs boson decay channel with the full reconstruction of the final state (H\ensuremath→\ensuremathγ\ensuremathγ) is presented, with a significance of 6.6 standard deviations (\ensuremathσ). 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\ensuremathσ. 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^\ensuremath-1. The cross section times branching fraction of the ttH process is measured to be \ensuremathσ_ttHB_\ensuremathγ\ensuremathγ=1.56_\ensuremath-0.32^+0.34 fb, which is compatible with the standard model prediction of 1.13_\ensuremath-0.11^+0.08 fb. The fractional contribution of the CP-odd component is measured to be f_CP^Htt=0.00\ifmmode±\else\textpm\fi0.33.

Citations

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Constraining anomalousHVVinteractions at proton and lepton colliders
• Long Short-Term Memory
• Observation of a new boson with mass near 125 GeV in pp collisions at √(s)=7 and 8 TeV
• The anti-ktjet clustering algorithm
• Measurement of the properties of a Higgs boson in the four-lepton final state
• Spin determination of single-produced resonances at hadron colliders
• Evidence for the spin-0 nature of the Higgs boson using ATLAS data
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC

Cited by

• CP Properties of Higgs Boson Interactions with Top Quarks in the tt¯H and tH Processes Using H→γγ with the ATLAS Detector
• Progress in \cal CP violating top-Higgs coupling at the LHC with Machine Learning
• H1jet, a fast program to compute transverse momentum distributions