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.
Highlights
The discovery of the Higgs boson at the CERN Large Hadron Collider (LHC) has marked the completeness and success of the Standard Model (SM)
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
By analyzing the dijet decay mode of the Higgs boson that is produced via the process eþe− → Zh at the future eþe− collider, instead of the conventional averaged jet energy profile (JEP) shown in Eq (1), we extract the information of κg from the accumulated JEP, which has better sensitivity to κg and will be explained in detail
Summary
The discovery of the Higgs boson at the CERN Large Hadron Collider (LHC) has marked the completeness and success of the Standard Model (SM). In view of the experimental observation, the dijet decay mode of the Higgs boson has a dominant contribution from the bottom quark pair, so the Higgs boson-gluon coupling is overwhelmed. To reveal Higgs boson-gluon coupling from Higgs decay, b tagging is an efficient tool to suppress the bottom quark contribution. B tagging is not enough to fully eliminate the quark jets from Higgs boson decay and the background processes to Higgs production. By analyzing the dijet decay mode of the Higgs boson that is produced via the process eþe− → Zh at the future eþe− collider, instead of the conventional averaged JEP shown in Eq (1), we extract the information of κg from the accumulated JEP, which has better sensitivity to κg and will be explained in detail .
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