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

-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

.

Note:

22 pages and 13 figures

14.70.Hp
12.60.Jv
12.38.Bx
14.65.Ha
top: pair production
Z0: associated production
quantum chromodynamics: supersymmetry
minimal supersymmetric standard model
photon photon: colliding beams
photon photon: exclusive reaction

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