Probing the top Yukawa coupling at the LHC via associated production of single top and Higgs

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

doi:10.1007/jhep09(2020)101

Probing the top Yukawa coupling at the LHC via associated production of single top and Higgs

Journal Article · Tue Sep 15 00:00:00 EDT 2020 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep09(2020)101· OSTI ID:1713183

Barger, Vernon ^[1]; Hagiwara, Kaoru ^[2]; Zheng, Ya-Juan ^[3]

Univ. of Wisconsin, Madison, WI (United States); OSTI
Shanghai Jiao Tong Univ. (China); KEK Theory Center and Sokendai, Tsukuba (Japan)
Univ. of Kansas, Lawrence, KS (United States)

We study Higgs boson production associated with single top or anti-top via t-channel weak boson exchange at the LHC. The process is an ideal probe of the top quark Yukawa coupling, because we can measure the relative phase of htt and hWW couplings, thanks to the significant interference between the two amplitudes. By choosing the emitted W momentum along the polar axis in the th ($$\bar{t}h$$) rest frame, we obtain the helicity amplitudes for all the contributing subprocesses analytically, with possible CP phase of the Yukawa coupling. We study the azimuthal asymmetry between the W emission and the Wb ($$\bar{b}$$) → t($$\bar{t}$$) h scattering planes, as well as several t and $$\bar{t}$$ polarization asymmetries as a signal of CP violating phase in the htt coupling. Both the azimuthal asymmetry and the polarization perpendicular to the scattering plane are found to have the opposite sign between the top and anti-top events. We identify the origin of the sign of asymmetries, and propose the possibility of direct CP violation test in pp collisions by comparing the top and anti-top polarization at the LHC.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Kansas, Lawrence, KS (United States); Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0017647; SC0019474

OSTI ID:: 1713183

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 9 Vol. 2020; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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