Offline calibrations and performance of the ATLAS Pixel Detector

The ATLAS Pixel Detector is the innermost detector of the ATLAS experiment at the Large Hadron Collider at CERN. It consists of 1744 silicon sensors equipped with approximately 80 millions electronic channels, providing typically three measurement points with high resolution for particles emerging from the beam-interaction region, thus allowing the measurement of particle tracks and secondary vertices with very high precision. In this talk the performance reached by the Pixel Detector with LHC collision data is presented, with particular attention to its spatial resolution, efficiency, particle identification properties, the measurement of the Lorentz angle. Examples of application of the Pixel Detector performance in physics results are also shown.