CMS tracker alignment validation with electron tracks

The CMS tracker is the largest silicon detector ever built. Its purpose is the reconstruction of charged particles tracks, from a collection of hits in the different tracker layers. To take advantage of the good resolution provided by the silicon sensors, we need to know precisely the position of all the tracker modules. For this purpose, minimization algorithms are used to estimate possible misalignments of these modules. Nevertheless, some global deformations may exist that are almost invisibles to these classical methods. The presented tool is sensible to some of these Weak Modes deformations, and is used to detect the eventual presence of one of these misalignments in the tracker geometry. The principle of the tool is explained. The results on Monte Carlo events reconstructed with a simulation of misaligned detector are shown. Finally, results on 2012 data are presented.