Tracking Performance of the ATLAS Inner Detector and Observation of Known Hadrons

The inner detector is the central tracking device of the ATLAS detector. In these proceedings the tracking performance of the inner detector is presented on collision data recorded at $\sqrt{s}$ = 900 GeV and 7 TeV in 2009 and 2010. The identification of resonances like $\Xi$ and $\Omega$ baryons in cascade decays via $K_{\mathrm{s}}$ and $\Lambda$ mesons is presented amongst the reconstruction of the $J / \psi $ and $\psi$(2S) mesons decaying into two muons. Furthermore, the performance of the track reconstruction and a data-driven method of estimating the track reconstruction efficiency as used in measurements of charged particle densities are discussed.