2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39977One-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.Proceedings of ICHEP2000 (July-August 2000, Osaka Japan), Talk given by Shinya Kanemura, 3 pages including 5 figuresHigh Energy Physics - Phenomenologytext