ATLAS Inner Detector Alignment Performance with February 2015 Cosmic Rays Data

Results of the first alignment of the new insertable B-Layer, which was installed during the first long shutdown, are presented. These results were obtained by using cosmic ray data collected in February 2015. Different alignment techniques have been used to improve the description of the detector geometry. After the alignment, biases in the track-to-hit residuals in cosmic ray data events have been corrected, and the improvement of the active modules resolution is quantified in terms of the Full Width Half Maximum figures of merit. The IBL global position has been determined at micron level with an averaged module resolution of 32 $\mu$m along the most sensitive direction of the module. Track parameters resolution has been studied using reconstructed split tracks.