HERA-B 01-137 Tracking 01-009 OTR/ITR-CATS: Tracking Based on Cellular Automaton and Kalman Filter

This note is devoted to the new track reconstruction package OTR/ITR-CATS developed for the Pattern Tracker of the HERA-B experiment. This package employs a combined approach for track reconstruction based on the use of a cellular automaton for track searching and the Kalman filter techniques for track fitting. A similar reconstruction strategy has been already successfully applied to the Vertex Detector System (VDS) [1, 2]. However, hit efficiencies and resolutions of the Pattern Tracker lower than those of the VDS require much more delicate implementation of the method. The developed package has been tested on simulated data and compared with two other competitive algorithms: default HERA-B reconstruction package RANGER [3] and reconstruction algorithm TEMA [4] based on Hough transform. The results of the tests regarding reconstruction efficiency, accuracy of estimates and computing time are presented.