Supersymmetry through CP violation in $H^{\pm }\to W^{\pm }{h}^0$

The CP violating asymmetry between the partial decay rates of $H^+ \to W^+ h^0$and$H^- \to W^- h^0$ is calculated at one-loop level in MSSM with complex parameters. The dependence on the phases of $A_{\tau }$ and $M_1$ is discussed. Different values of $\tan \beta$ are considered. The asymmetry is up to the order of ${10}^{-2}$.