ATLAS Tracking and Vertexing Performance

The ATLAS experiment is one of two general purpose detectors at the Large Hadron Collider. ATLAS is equipped with a charged particle tracking system built on three subdetectors, which provide high precision measurements made from a fine detector granularity. The pixel and microstrip subdetectors, which use the silicon technology, are complemented with the transition radiation tracker. Data taken at center-of-mass energies of 900 GeV and 7 TeV were analyzed. The performance of the track reconstruction in terms of tracking efficiency and track parameter resolutions is presented. The precise knowledge of the material in the Inner Detector is vital for understanding the tracking performance and thus important for many physics analyses. Therefore detailed comparisons between data and Monte Carlo have been performed and contributed significantly to the understanding of the detector. The performance of the primary vertex reconstruction in terms of efficiency and resolutions is also presented. Both, efficiency and resolutions of the primary vertices, are measured using a data driven method which will also be presented.