T-odd quark pair production and decay at γγ collider in the littlest Higgs model with T-parity in next-to-leading order QCD

Abstract

We calculate the complete next-to-leading order (NLO) QCD corrections to the [Formula: see text]-odd mirror quark pair [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] production in the littlest Higgs model with [Formula: see text]-parity (LHT) at a high energy [Formula: see text] collider. We present the dependence of the leading order (LO) and NLO QCD corrected cross sections on the colliding energy [Formula: see text]. Our calculation includes the subsequent full weak decays of the final [Formula: see text]-odd mirror quarks by adopting the narrow width approximation and the exclusive 2-jet event selection criterion. We provide the LO and QCD NLO kinematic distributions of final particles. We find that the NLO QCD correction is phase space dependent and modifies the LO cross section evidently. The [Formula: see text]-factor increases noticeably when [Formula: see text] approaches the threshold of the on-shell [Formula: see text]-pair production. We conclude that it is possible to separate the signature of the [Formula: see text]-odd quark pair production from possible Standard Model (SM) background by taking proper kinematic cut.