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We investigate the decays of the light stop in scenarios with the lightestneutralino $\tilde{\chi}_1^0$ being the lightest supersymmetric particle,including flavour-violating (FV) effects. We analyse the region where thethree-body decay $\tilde{t}_1\to W b \tilde{\chi}_1^0$ is kinematically allowedand provide a proper description of the transition region between thethree-body decay and the four-body decay $\tilde{t}_1 \to\tilde{\chi}_1^0 b f\bar{f}'$. The improved treatment has been implemented in the Fortran package{\tt SUSY-HIT} and is used for the analysis of this region. A scan over theparameter range including all relevant experimental constraints reveals thatthe FV two-body decay into charm and $\tilde{\chi}_1^0$ can be as important asthe three-, respectively, four-body decays if not dominant and therefore shouldbe taken into account in order to complete the experimental searches for thelight stop.

Light stop decays into $W b \tilde{\chi}_1^0$ near the kinematic threshold