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Last modification:
2003-07-22
e-mail:
cblume@cern.ch korus@cern.ch

Matching

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.