Matching a reconstructed track to the simulated trajectory from which it originates involves
first matching the reconstructed clusters to the simulated space
points from which they originate. This is done by a correlation in position over a predefined search
area in the pad row plane. The search area used is a square of
0.5 x 0.5 cm, which is large enough to ensure matching an event even when relatively large cluster
displacements occur due to cluster merging. This large search area
can result in multiple matches between clusters and space points. All matches are recorded in linked
lists and ambiguities are resolved at the track matching level.
Track matching is accomplished by finding GNA49 tracks whose space points are matched with
a minimum number of reconstructed points on a reconstructed track.
This analysis is done first on the track segments within each TPC and the results are then
tabulated for the full length of the global track over several TPC's.