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We present the complete electroweak one-loop corrections to the partialwidths for two-body decays of a chargino (neutralino) into a W-boson and aneutralino (chargino). We perform the calculation for the minimal and thenext-to-minimal supersymmetric standard model using an on-shell renormalizationscheme. Particular attention is paid to the question of gauge invariance whichis achieved using the so-called pinch technique. Furthermore we show that thesecorrections show a strong parameter dependence and usually are in the range of1-10 percent if the neutralino involved is a higgsino or wino like state.However, in case of a bino-like or a singlino-like neutralino the correctionscan go up to 50% and more. Moreover we present the public program CNNDecaysperforming these calculations.

Electroweak corrections to Neutralino and Chargino decays into a W-boson in the (N)MSSM