Tracking and Alignment Performance of the LHCb silicon detectors

The LHCb experiment is primarily dedicated to the study of new physics through the heavy flavour decays. The tracking system of LHCb is composed of a silicon micro-strip vertex detector, two silicon strip tracker detectors and a set of straw-tube drift chambers in front of and behind a dipole generating a magnetic field. This system provides precise measure of the vertex position and high momentum resolution. The performances of the silicon tracking subdetectors in terms of hit resolution and detector efficiencies, as well as the overall track reconstruction performance and the alignment status, are reported.