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

Barger, Vernon; Hagiwara, Kaoru; Zheng, Ya-Juan

doi:10.1103/PhysRevD.99.031701

Title: Probing the Higgs Yukawa coupling to the top quark at the LHC via single $top + Higgs$ production

Journal Article · Wed Feb 20 00:00:00 EST 2019 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.99.031701· OSTI ID:1495239

Barger, Vernon; Hagiwara, Kaoru; Zheng, Ya-Juan

The conjoined production at the LHC of the 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 $h t t$ and the $h W W$ 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 $C P$ violation, even after partial integration over the forward jet momentum. This $C P$ violating asymmetry may be observed at the LHC via the component of the top-quark polarization that is perpendicular to the th scattering plane.

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Research Organization:: Univ. of Kansas, Lawrence, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0017647

OSTI ID:: 1495239

Alternate ID(s):: OSTI ID: 1630741

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 99 Journal Issue: 3; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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References (17)

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