The SUSY EW-like corrections to top pair production in photon-photon collisions

Abstract

We studied the one-loop contributions of the gaugino-Higgsino-sector to the process of top-pair production via $γγ$ fusion at NLC in frame of the Minimal Supersymmetric Model(MSSM). We find that the corrections to $γγ\to t\bar{t}$ and $e^+ e^- \to γγ\to t\bar{t}$ are found to be significant and can approach to a few percent and one percent, respectively. Furthermore, the dependences of the corrections on the supersymmetric parameters are also investigated. The corrections are not sensitive to $M_{SU(2)}$ (or $|μ|$) when $M_{SU(2)}~>>~|μ|$ (or $|μ|~>>~M_{SU(2)}$) and are weakly dependent on the $\tanβ$ with $M_Q$ (or $|μ|$) being large enough. But they are sensitive to the c.m.s. energy of the incoming photons.