Performance studies of the Silicon Detectors in STAR towards microvertexing of rare decays

Heavy quarks ($b$ and $c$) carrying hadron production as well as their elliptic flow can be used as a probe of the thermalization of the medium created in heavy ions collisions. Direct topological reconstruction of $D$, $B$ mesons and $\Lambda_{\mathrm{c}}$ baryon decays is then needed to obtain this precise measurement. To achieve this goal the silicon detectors of the STAR experiment are explored. These detectors, a Silicon Drift (SVT) 3-layer detector [1] and a Silicon Strip one-layer detector [2] provide tracking very near to the beam axis and allow us to search for heavy flavour with microvertexing methods. $D^{0}$ meson reconstruction including the silicon detectors in the tracking algorithm will be presented for the Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV, and physics opportunities will be discussed. \\[4pt] [1] R. Bellwied et al., \textit{Nucl. Inst. Methods} {\bf A499} (2003) 640. \\[0pt] [2] L. Arnold et al., \textit{Nucl. Inst. and Methods} {\bf A499} (2003) 652.