Search for pixel clusters in the VELO silicon strip detector

The analysis of the pixel clusters is intended to be used to improve the alignment of the LHCb silicon vertex detectors. The pixel clusters are created by tracks that pass through the tiny gap between radial strips and produce a cluster on either side. They give a position measurements which is equally accurate in R and phi, hence phi information can be extracted from the R-detectors and compared to the expected phi of the clusters if the detectors were aligned. This allows us to realign the detectors based on the phi positions of the pixel clusters.