CP violation in semi-leptonic decays of the top quark within MSSM

Abstract.

We calculate the CP violating effects in the top quark semi-leptonic three body decays induced by the supersymmetric CP-odd phase of the top squark trilinear soft breaking term ${\rm arg}(A_t)$. The light top squark mass is assumed to be close to the top quark mass, $m_{\tilde{t}}\sim m_t$. The CP conserving phase is provided by the $\chi^+$ and $\chi^0$ cut. We find that the partial rate asymmetry is on the 0.1% level. In the most favorable parameter region the decay rate asymmetry can reach up to 0.55%.