$CP$-odd anomalous $W$-boson couplings from supersymmetry

Abstract.

The supersymmetric standard model contains a new $CP$-violating phase in the mass matrices for charginos and neutralinos, which could induce $CP$-odd anomalous couplings for the $WWZ$ and $WW\gamma$ vertices at the one-loop level. We study these couplings, paying attention to the model-parameter and $q^2$ dependencies. It is shown that the $CP$-odd form factors could have values of order $10^{-3}-10^{-4}$, which are much larger than those predicted by the standard model. We also discuss the possibility of examining these form factors in experiments.