Measurements of spatial resolution of ATLAS pixel detectors

Irradiated and not irradiated silicon pixel detectors developed for the ATLAS experiment were tested in a beam. Digital and analog resolutions were determined comparing the positions measured by a microstrip telescope and by the pixel detector. Digital resolutions of 10 μm and analog resolutions of 6 μm (before irradiation) and 10 μm (after irradiation) are obtained without subtracting the error on the position determined by the telescope.