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

TL;DR

This paper investigates CP violation in semi-leptonic top quark decays within the MSSM, focusing on the effects of the CP-odd phase of the top squark trilinear coupling, and finds asymmetries up to 0.55%.

Contribution

It introduces a calculation of CP-violating effects in top decays induced by MSSM phases, highlighting the potential size of observable asymmetries.

Findings

Partial rate asymmetry around 0.1%.

Decay rate asymmetry can reach 0.55%.

CP violation effects are significant within certain MSSM parameters.

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 $\arg(A_t)$. 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 in the 0.1% level. In the most favorable parameter region the decay rate asymmetr can reach up to 0.55%.