Probing the $Hgg$ coupling through the jet charge correlation in Higgs boson decay

TL;DR

This paper introduces a new method using jet charge asymmetry to measure the Higgs gluon coupling at future lepton colliders, enhancing the precision of Higgs property studies.

Contribution

It proposes a novel jet charge asymmetry technique to extract the Higgs-gluon coupling, independent of jet charge parameter assumptions.

Findings

Jet charge asymmetry is close to one for Higgs to gluon decay.

Background processes yield asymmetry values greater than one.

Method can effectively constrain the Higgs gluon coupling at future colliders.

Abstract

The effective coupling of the Higgs boson to gluons determines the production rate of the Higgs boson at the LHC and plays a crucial role to measure the Higgs properties. In this paper, we propose a novel method to extract the Higgs gluon gauge coupling information at the future lepton colliders, by utilizing the jet charge asymmetry of the two leading jets from the Higgs boson decay. Owing to the jet charge correlation nature of the Higgs decay products, we demonstrate that this asymmetry value would be close to one for the signal $H\to gg$, while it is always larger than one for the dominated backgrounds. With the help of the jet charge information, it is possible to constrain the Higgs gluon effective coupling very well in the future Higgs factory and this conclusion is not sensitive to the jet charge parameter $\kappa$.