One-loop QCD corrections to the $e^+e^- \to W^+ W^- b\bar b$ process at the ILC

TL;DR

This paper calculates the full one-loop QCD corrections to the e+e- to W+W-bb process at the ILC, revealing significant energy-dependent variations in the cross section and providing detailed kinematic distributions.

Contribution

It provides the first comprehensive calculation of NLO QCD corrections to this process at the ILC using the complex mass scheme.

Findings

K-factor varies from 1.501 to 0.847 with energy increase

Cross sections depend on collision energy and Higgs mass

Distributions of transverse momenta and invariant masses are presented

Abstract

We study the full contributions at the leading order(LO) and QCD next-to-leading order(NLO) to the cross section of the \eewwbb process in the standard model(SM) at the ILC. In dealing the resonance problem we adopted the complex mass scheme in both tree-level and one-loop level perturbative calculations. Our numerical results show that the K-factor varies from 1.501 to 0.847 when $\sqrt{s}$ goes up from $360 GeV$ to $1.5 TeV$. We investigate the dependence of the LO and QCD NLO corrected cross sections of process \eewwbb on colliding energy $\sqrt{s}$ and Higgs-boson mass. We also present the results of the LO and QCD NLO corrected distributions of the transverse momenta of final particles, and the invariant masses of $Wb$-, $b\bar b$- and $WW$-pair.