Scalar top quarks at the Run II of the Tevatron in the high tanβ regime

We discuss the decays of the lightest scalar top quark $\tilde{t}_1$ in the Minimal Supersymmetric extension of the Standard Model and show that the final state $b\tau \nu_\tau \chi_1^0$, where $\chi_1^0$ is the lightest supersymmetric particle, can be dominant in a significant area of the parameter space, in particular in the high $\tan \beta$ regime. We then analyze the prospects for discovering relatively light scalar top quarks accessible at the Tevatron Run II in the $b\tau$ and missing energy channel.