Measurements of $\mathrm{t}\bar{\mathrm{t}}$H production and the CP structure of the Yukawa interaction between the Higgs boson and the top quark in the diphoton decay channel

Abstract

The first observation of the $\mathrm{t}\bar{\mathrm{t}}$H process in a single Higgs boson decay channel with the full reconstruction of the final state (H$\to \gamma \gamma$) is presented, with a significance of 6.6 standard deviations ($\sigma$). 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$\sigma$. 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 $\mathrm{t}\bar{\mathrm{t}}$H process is measured to be ${\sigma }_{\mathrm{t}\bar{\mathrm{t}}\mathrm{H}}{\mathcal{B}}_{\gamma \gamma }=$ 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 $f_{\mathrm{CP}}^{\mathrm{Htt}}=$ 0.00 $\pm$ 0.33.

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)

References in corpus (16)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Particle-flow reconstruction and global event description with the CMS detector
• The CMS trigger system
• Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV
• Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs
• Higgs boson production in association with top quarks in the POWHEG BOX
• Measurements of the Higgs boson width and anomalous HVV couplings from on-shell and off-shell production in the four-lepton final state
• Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
• $CP$ Properties of Higgs Boson Interactions with Top Quarks in the $t\bar{t}H$ and $tH$ Processes Using $H\to \gamma \gamma$ with the ATLAS Detector
• Handling uncertainties in background shapes: the discrete profiling method
• Constraints on anomalous Higgs boson couplings using production and decay information in the four-lepton final state
• Search for direct production of supersymmetric partners of the top quark in the all-jets final state in proton-proton collisions at sqrt(s) = 13 TeV

Cited by in corpus (51)

• HiggsSignals-2: Probing new physics with precision Higgs measurements in the LHC 13 TeV era
• Collider Physics at the Precision Frontier
• $CP$ Properties of Higgs Boson Interactions with Top Quarks in the $t\bar{t}H$ and $tH$ Processes Using $H\to \gamma \gamma$ with the ATLAS Detector
• Measurements of Higgs boson production cross sections and couplings in the diphoton decay channel at $\sqrt{s}=$ 13 TeV
• Search for nonresonant Higgs boson pair production in final states with two bottom quarks and two photons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Constraints on anomalous Higgs boson couplings to vector bosons and fermions in its production and decay using the four-lepton final state
• New features in the JHU generator framework: constraining Higgs boson properties from on-shell and off-shell production
• Search for a heavy Higgs boson decaying into a $Z$ boson and another heavy Higgs boson in the $\ell \ell bb$ and $\ell \ell WW$ final states in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• SPANet: Generalized Permutationless Set Assignment for Particle Physics using Symmetry Preserving Attention
• Constraining the CP structure of Higgs-fermion couplings with a global LHC fit, the electron EDM and baryogenesis
• Machine learning the Higgs boson-top quark CP phase
• Indirect $\mathcal{C}\mathcal{P}$ probes of the Higgs-top-quark interaction: current LHC constraints and future opportunities
• Probing the CP structure of the top quark Yukawa coupling: Loop sensitivity vs. on-shell sensitivity
• Direct Higgs-top CP-phase measurement with $t\bar{t}h$ at the 14 TeV LHC and 100 TeV FCC
• Measurements of Higgs boson production in the decay channel with a pair of $\tau$ leptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Production and decay of the Higgs boson in association with top quarks
• The Higgs boson -- its implications and prospects for future discoveries
• Returning CP-Observables to The Frames They Belong
• Search for flavor-changing neutral current interactions of the top quark and Higgs boson in final states with two photons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• ATLAS Violating CP Effectively
• A Reduced basis for CP violation in SMEFT at colliders and its application to Diboson production
• Measurement of the $CP$ properties of Higgs boson interactions with $\tau$-leptons with the ATLAS detector
• Constraints on Higgs boson properties using $W{W}^{\ast }(\to e\nu \mu \nu )jj$ production in 36.1 fb${}^{-1}$ of $\sqrt{s}$=13 TeV $pp$ collisions with the ATLAS detector
• Effective Theories with Dark Matter Applications
• Constraining anomalous Higgs boson couplings to virtual photons
• Constraints on anomalous Higgs boson couplings to vector bosons and fermions from the production of Higgs bosons using the $\tau \tau$ final state
• P-even, CP-violating Signals in Scalar-Mediated Processes
• Off-shell probes of the Higgs Yukawa couplings: light quarks and charm
• Constraints on anomalous Higgs boson couplings from its production and decay using the WW channel in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Flavor changing top decays to charm and Higgs with $\tau \tau$ at the LHC
• Search for new physics using effective field theory in 13 TeV pp collision events that contain a top quark pair and a boosted Z or Higgs boson
• Les Houches 2023 -- Physics at TeV Colliders: Report on the Standard Model Precision Wishlist
• Test of $CP$ Invariance in Higgs Boson Vector-Boson-Fusion Production Using the $H\to \gamma \gamma$ Channel with the ATLAS Detector
• Charged Higgs decay to $W^{\pm }H$ at a high energy lepton collider
• Machine-Learning Performance on Higgs-Pair Production Associated with Dark Matter at the LHC
• Study on the sensitivity of the Higgs boson couplings in photon-photon collision at CLIC and muon collider
• Improving Heavy Dijet Resonance Searches Using Jet Substructure at the LHC
• Kinematic corrections and reconstruction methods for neutral Higgs boson decay to $b\bar{b}$ in 2HDM type-I at future lepton colliders
• Probing CP-violating Higgs-gauge Boson Couplings at Future Muon Collider
• State-of-the-art cross sections for ttH: NNLO predictions matched with NNLL resummation and EW corrections
• Heavy neutral 2HDM Higgs Boson Pair Production at CLIC Energies
• Energy correlation of bottom quarks from decays of top quarks in electron$-$positron annihilation
• Interpretation of LHC excesses at 95 GeV and 152 GeV in an extended Georgi-Machacek model
• H1jet, a fast program to compute transverse momentum distributions
• Observability of 2HDM charged Higgs boson in a misaligned scenario
• Pseudoscalar Higgs boson decay to three parton amplitudes at NNLO to higher orders in the dimensional regulator
• Proposal for simplified template cross-sections extension using $\mathcal{C}\mathcal{P}$ observables in $t\overline{t}H$
• Combination of measurements of CP properties of Higgs boson interactions with vector bosons using proton-proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for a narrow resonance with a mass between 10 and 70 GeV decaying to a pair of photons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Complete NLO corrections to $t\bar{t}\gamma$ and $t\bar{t}\gamma \gamma$
• $t\bar{t}jj$ -- NLO QCD corrections to top quark pair production and decays at the LHC