SUSY QCD impact on top-pair production associated with a $Z^0$-boson at a photon-photon collider

TL;DR

This paper analyzes the impact of supersymmetric QCD corrections on top-pair production with a Z-boson at photon colliders, highlighting significant effects in polarized collision modes and energy dependence.

Contribution

It provides the first detailed calculation of SQCD NLO corrections to this process and compares them with SM QCD effects across different polarization modes and energies.

Findings

SQCD effects are more significant in + + polarized mode.

Relative SQCD correction varies from 32.09% to -1.89%.

Distributions of invariant mass and transverse momentum are affected by SQCD corrections.

Abstract

The top-pair production in association with a $Z^0$-boson at a photon-photon collider is an important process in probing the coupling between top-quarks and vector boson and discovering the signature of possible new physics. We describe the impact of the complete supersymmetric QCD(SQCD) next-to-leading order(NLO) radiative corrections on this process at a polarized or unpolarized photon collider, and make a comparison between the effects of the SQCD and the standard model(SM) QCD. We investigate the dependence of the lowest-order(LO) and QCD NLO corrected cross sections in both the SM and minimal supersymmetric standard model(MSSM) on colliding energy $\sqrt{s}$ in different polarized photon collision modes. The LO, SM NLO and SQCD NLO corrected distributions of the invariant mass of $t\bar t$-pair and the transverse momenta of final $Z^0$-boson are presented. Our numerical results show that the pure SQCD effects in \ggttz process can be more significant in the $+ +$ polarized photon collision mode than in other collision modes, and the relative SQCD radiative correction in unpolarized photon collision mode varies from 32.09% to $-1.89 %$ when $\sqrt{s}$ goes up from $500 GeV$ to $1.5 TeV$.