Probing the Top-Yukawa Coupling in Associated Higgs production with a Single Top Quark

Abstract

Associated production of the Higgs boson with a single top quark proceeds through Feynman diagrams, which are either proportional to the hWW, top-Yukawa, or the bottom-Yukawa couplings. It was shown in literature that the interference between the top-Yukawa and the gauge-Higgs diagrams can be significant, and thus the measurement of the cross sections can help pin down the sign and the size of the top-Yukawa coupling. Here we perform a detailed study with full detector simulations of such a possibility at the LHC-14 within the current allowed range of hWW and top-Yukawa couplings, using h-> b b-bar, γγ, τ+ τ-, ZZ* -> 4 l modes. We found that the LHC-14 has the potential to distinguish the size and the sign of the top-Yukawa coupling. Among the channels the h-> b b-bar mode mode provides the best chance to probe the signal, followed by the h -> γγ mode, which has the advantage of a narrow reconstructed mass peak. We also pointed out that the spatial separation among the final-state particles has the potential in differentiating among various values of the top-Yukawa coupling.

28 pages, 13 figures; a comment about NLO correction is added, references added; match the published version

References in corpus (5)

• 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
• Implications of CTEQ global analysis for collider observables
• Next-to-leading-order predictions for t-channel single-top production at hadron colliders
• Higher-order soft gluon corrections in single top quark production at the LHC

Cited by in corpus (14)

• Physics at a 100 TeV pp collider: Higgs and EW symmetry breaking studies
• Anomalous Top-Higgs Couplings and Top Polarisation in Single Top and Higgs Associated Production at the LHC
• Exploring the Anomalous Higgs-top Couplings
• Enhanced $thj$ signal at the LHC with $h\to \gamma \gamma$ decay and $\mathcal{C}\mathcal{P}$-violating top-Higgs coupling
• Implications of CP-violating Top-Higgs Couplings at LHC and Higgs Factories
• Enhancing $thj$ Production from Top-Higgs FCNC Couplings
• Constraining CP-violation in the Higgs-top-quark interaction using machine-learning-based inference
• Impact of top-Higgs couplings on di-Higgs production at future colliders
• Top Yukawa coupling measurement with indefinite CP Higgs in $e^{+}{e}^{-}\to t\bar{t}\Phi$
• The accidental Higgs
• Associated production of single top and Higgs at the LHC in the littlest Higgs model with T-parity
• Rare Standard Model processes for present and future hadronic colliders
• Sensitivity to $\mathcal{C}\mathcal{P}$-violating effective couplings in the top-Higgs sector
• Search for the production of a Higgs boson in association with a single top quark in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector