QCD corrections to the $\gamma\gamma b\bar b$ production at the ILC

TL;DR

This paper calculates the QCD corrections to the process $e^+e^- o \gamma\gamma bar b$ at the ILC, crucial for accurate Higgs decay measurements, analyzing cross sections and distributions.

Contribution

It provides the first detailed analysis of ${ m O}(\alpha_s)$ QCD corrections to this background process at the ILC, including energy dependence and jet veto effects.

Findings

QCD corrections significantly affect cross sections.

Distributions of transverse momenta are modified by corrections.

Results aid in precise Higgs decay measurements at the ILC.

Abstract

The $e^+e^- \to \gamma\gamma b\bar b$ is an irreducible background process in measuring the $H^0 \to \gamma\gamma$ decay width, if Higgs boson is produced in association with a $Z^0$-boson which subsequently decays via $Z^0 \to b\bar b$ at the ILC. In this paper we study the impact of the ${\cal O}(\alpha_s)$ QCD corrections to the observables of the $e^+e^- \to \gamma\gamma b\bar b$ process in the standard model. We investigate the dependence of the leading-order and ${\cal O}(\alpha_s)$ QCD corrected cross sections on colliding energy and the additional jet veto schemes. We also present the results of the LO and ${\cal O}(\alpha_s)$ QCD corrected distributions of the transverse momenta of final particles, and the invariant masses of $b\bar b$- and $\gamma\gamma$-pair.