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

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