One-loop contributions of the super-partner particles to $e^-e^+ \to   W^-W^+$ in the MSSM
  One-loop contributions of super-partner particles to $W$-pair production at $e^+e^-$ collision are discussed in the MSSM. To obtain trustworthy results we test our calculation using three methods: (1) sum rules among form factors which result from the BRS invariance, (2) the decoupling theorem, (3) the high-energy stability. We examine the corrections taking into account constraints from the direct search experiments and the precision data. The results for the sfermion contributions are presented. 
Kaoru Hagiwara (KEK), Shinya Kanemura (Karlsruhe Univ), Yoshiaki Umeda   (Hamburg Univ)