DF Definitions of Tracking Elements

Below are definitions of the structures used in the clas12 dc reconstructions.

Hits

"A DC hit is characterized by superlayer, layer, sector, wire number, and time."

<Veronique Ziegler, clas12-offline-software, Hit.java/p>

Hit.java defines the representation of a drift chamber wire hit.

Clusters

"A cluster in the DC consists of an array of hits that are grouped together according to the algorithm of the ClusterFinder class" - Veronique Ziegler, clas12-offline-software, Cluster.java

Segments

"A class to describe segment objects, where a Segment is a fitted cluster that has been pruned of hits with bad residuals" - Veronique Ziegler, clas12-offline-software, Segment.java

Crosses

"The crosses are objects used to find tracks and are characterized by a 3-D point and a direction unit vector." - Veronique Ziegler, clas12-offline-software, Cross.java

Tracks

"A class representing track candidates in the DC. A track has a trajectory represented by an ensemble of geometrical state vectors along its path, a charge and a momentum" - Veronique Ziegler, clas12-offline-software, Track.java