Real Time Tracking with ATLAS Silicon Detectors and its Applications to Beauty Hadron Physics

The purpose of the work presented here is a complete characterization of a track reconstruction algorithm, SiTrack, based on data coming from the silicon detectors and designed to operate in the on-line event selection system of the ATLAS The application of the SiTrack algorithm to different physics selections will be discussed and the corresponding results will be provided, both in terms of pure tracking performance and of impact on the physical event selection strategy. After a brief overview of flavour physics, the present status of the Unitarity Triangle determination is presented, along with the expected ATLAS reach in this sector.