TRACKING DETECTOR ALIGNMENT USING CONSTRAINED VERTEX FITS

We present a method to align between sections of a particle tracking d etector exploiting the fact that most of the tracks in an event origin ate from a common spatial point. The method optimizes the reconstructi on of interaction vertices of high energy particle collisions and is p articularly useful for aligning sections of a detector which cover dif ferent ranges of the 4pi solid angle. A fast algorithm, suitable for o nline use, is derived. We demonstrate this method for the P238 vertex detector and present results with data and simulation.