Gluino-mediated Rare B Decays *

Apart from the low-energy regime of the strong interaction, flavour physics is the least tested part of the SM. This is reflected in the rather large error bars of several flavour parameters such as the mixing parameters at the twenty percent level [1]. However, the experimental situation concerning B physics will drastically change in the near future. There are several B physics experiments successfully running at the moment. In the upcoming years new facilities will start to explore B physics with increasing sensitivity and within different experimental settings [2]. The b quark system is an ideal laboratory for studying flavour physics. Hadrons containing a b quark are the heaviest hadrons experimentally accessible. Since the mass of the b quark is much larger than the QCD scale, the long-range strong interactions are expected to be comparably small and are well under control thanks to the heavy quark expansion [3,4]. Of particular interest are the so-called rare B decays, which are flavour changing neutral current processes (FCNC) which vanish at the tree level of the SM. Thus, they are rather sensitive probes for physics beyond the SM [5,6]. One of the main difficulties in analysing rare B decays is the calculation of short-distance QCD effects. These radiative corrections lead to a