Supersymmetric QCD Corrections to Top Quark Pair Production in   Photon-Photon Collision
  Supersymmetric QCD corrections to top quark pair production by photon fusion are calculated in the minimal supersymmetric standard model taking into account of the effects of stops in the corrections to the total cross-section of t anti-t production at the future electron-positron linear collider. We find that the relative correction can be a few percent for reasonable values of the parameters. 
Hua Wang, Chong-Sheng Li, Hong-Yi Zhou, Yu-Ping Kuang