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

We calculate the complete next-to-leading order (NLO) QCD corrections to the T-odd mirror quark pair (q_(q) over bar_ = u_(u) over bar_, c_(c) over tilde_, d_(d) over bar_, s_(s) over bar_) production in the littlest Higgs model with T-parity (LHT) at a high energy gamma gamma collider. We present the dependence of the leading order (LO) and NLO QCD corrected cross sections on the colliding energy root s. Our calculation includes the subsequent full weak decays of the final T-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 K-factor increases noticeably when root s approaches the threshold of the on-shell q_-pair production. We conclude that it is possible to separate the signature of the T-odd quark pair production from possible Standard Model (SM) background by taking proper kinematic cut.