Probing the Higgs Yukawa coupling to the top-quark at the LHC via single top + Higgs production

Abstract

The conjoined production at the LHC of single top and Higgs boson via $t$-channel weak boson exchange is ideal to probe the top-quark Yukawa coupling, due to a delicate cancellation between the amplitudes with the $htt$ and the $hWW$ couplings. We find that the top quark is produced with $100\%$ polarization in the leading order, and its quantum state is determined by the spin-vector direction in the $t$-quark rest frame. We relate the spin direction to the four-momenta of the top, Higgs and a jet in the helicity amplitude framework. We identify a polarization asymmetry that is sensitive to CP violation, even after partial integration over the forward jet momentum. This CP violating asymmetry may be observed at the LHC via the component of the top-quark polarization that is perpendicular to the $th$ scattering plane.

arXiv comment5 pages, 5 figures; typos corrected, references added

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Cited by in corpus (11)

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• 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
• Constraining CP-violation in the Higgs-top-quark interaction using machine-learning-based inference
• The Higgs boson -- its implications and prospects for future discoveries
• Probing the electroweak symmetry breaking with Higgs production at the LHC
• Probing the CP Structure of the Top Quark Yukawa at the Future Muon Collider
• Enhancing $CP$ Measurement of the Yukawa Interactions of Top-Quark at $e^{-}{e}^{+}$ Collider
• Exploring BSM Higgs couplings in single top-quark production
• Probing the top Yukawa coupling at the LHC via associated production of single top and Higgs