Probing anomalous tqh couplings via single top production in associated with the Higgs boson at the HE-LHC and FCC-hh

Yan-Ju Zhang; Jie-Fen Shen

doi:10.1140/epjc/s10052-020-8374-z

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2020) 80: 811
https://doi.org/10.1140/epjc/s10052-020-8374-z

Regular Article - Theoretical Physics

Probing anomalous tqh couplings via single top production in associated with the Higgs boson at the HE-LHC and FCC-hh

Yan-Ju Zhang and Jie-Fen Shen^b

School of Biomedical Engineering, Xinxiang Medical University, 453003, Xinxiang, People’s Republic of China

^b shjf@xxmu.edu.cn

Received: 28 June 2020
Accepted: 17 August 2020
Published online: 2 September 2020

Abstract

We investigate the prospects for discovering the Flavour Changing Neutral Current (FCNC) tqh couplings via the process $p p \to t h$ $pp\rightarrow th$ at the proposed High Energy Large Hadron Collider (HE-LHC) and Future Circular Collider in hadron-hadron mode (FCC-hh) including the realistic detector effects. The relevant SM backgrounds are considered in the cut based analysis to obtain the limits on the the branching ratios of $t \to q h (q = u, c)$ $t\rightarrow qh~(q=u,c)$ , followed by the leptonic decay channel of the top quark and diphoton decay channel of the Higgs boson. The upper limits on the FCNC branching ratios at 95% confidence level (CL) and the $5 σ$ $5\sigma$ discovery reach for the different integrated luminosities are obtained. It is shown that at the 27 TeV HE-LHC with an integrated luminosity of 15 ab $^{- 1}$ $^{-1}$ and at the 100 TeV FCC-hh with an integrated luminosity of 30 ab $^{- 1}$ $^{-1}$ , the BR( $t \to u h$ $t\rightarrow uh$ ) (BR( $t \to c h$ $t\rightarrow ch$ )) can be probed, respectively, to $4.4 (6.4) \times 10^{- 5}$ $4.4~(6.4)\times 10^{-5}$ and $1.3 (1.6) \times 10^{- 5}$ $1.3~(1.6) \times 10^{-5}$ at the 95% CL.

© The Author(s) 2020

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