Probing the Higgs boson-gluon coupling via the jet energy profile at $e^+e^-$ colliders

TL;DR

This paper introduces new jet energy profile observables to precisely measure the Higgs-gluon coupling at future $e^+e^-$ colliders, significantly reducing uncertainties compared to conventional methods.

Contribution

It proposes novel observables based on jet energy profiles for extracting the Higgs-gluon coupling with improved precision at $e^+e^-$ colliders.

Findings

Statistical uncertainty of about 1.6% for the effective coupling.

Reduction of uncertainty by 52% compared to traditional methods.

Potential for precise measurement of Higgs-gluon coupling at future colliders.

Abstract

The effective coupling of the Higgs boson to a gluon pair is one of the most important parameters to test the Standard Model and search for the new physics beyond. In this paper, we propose several new observables based on the jet energy profile to extract the effective coupling. The statistical uncertainties of the effective coupling extracted by using new observables are derived and estimated based on the simulation at the future $e^+e^-$ collider for $250$ GeV center-of-mass energy and 5 ab$^{-1}$ integrated luminosity. We found that the statistical uncertainties of effective coupling via the optimized observable can reach about $1.6\%$ in the channels of a $Z$ boson decaying to lepton pairs and is reduced by $52\%$ compared to the relevant uncertainties in the conventional approach. These new observables potentially can be helpful for the measurement of effective coupling at future $e^+e^-$ colliders.