LHCb Tracking, Alignment and Physics Performance

The LHCb experiment at the LHC is designed for precision heavy flavour physics. Its tracking, alignment and physics performance is discussed with focus on the silicon strip detectors. First results of the tracking efficiency measured with collision data are presented as well as single hit, impact parameter and vertex resolutions. The tracking efficiency is above $95\%$ for all tracks with a transverse momentum above $100~\rm{MeV}/c$ which covers the full physics range. The single hit resolution of the VErtex LOcator (VELO) sensors for tracks of optimal incidence is better than $4~\rm{\mu{}m}$ for a strip pitch of $40~\rm{\mu{}m}$. The impact parameter resolution is found to be about $30~\rm{\mu{}m}$ for tracks with $3~\rm{GeV}/c$ transverse momentum. The status of the spatial detector alignment is described before discussing the proper time reconstruction performance.