Prospect study for measurement of $Hb\bar{b}$ coupling at the LHC and FCC-hh

TL;DR

This study investigates the potential of the $H+b+jets$ signature at the LHC and FCC-hh to precisely measure the $Hbar{b}$ couplings, including CP properties, using advanced analysis techniques and a novel asymmetry based on lab-frame momenta.

Contribution

It introduces a comprehensive analysis framework for probing $Hbar{b}$ couplings and CP violation at future colliders, utilizing a multivariate approach and a new lab-frame asymmetry.

Findings

Significant sensitivity to $Hbar{b}$ couplings at LHC and FCC-hh.

Effective discrimination of signal from background using multivariate analysis.

Proposed a novel lab-frame asymmetry to probe CP violation.

Abstract

This paper employs the $H+b+\text{jets}$ signature in proton-proton collisions to explore the structure of the $Hb\bar{b}$ couplings.The focus of the analysis lies in the decay of the Higgs boson into a photon pair, taking into account both reducible and irreducible backgrounds and a realistic simulation of the detector effects. To enhance the discrimination between signal and background, a multivariate analysis is employed to analyse the kinematic variables and optimise the signal-to-background ratio. The results indicate that the $H+b+\text{jets}$ process can significantly contribute to the precise measurement of CP-even and CP-odd couplings between the bottom quark and the Higgs boson at the LHC and FCC-hh. Finally, a novel asymmetry is introduced for the purpose of probing CP violation within the $Hb\bar{b}$ coupling, formulated exclusively based on lab-frame momenta.