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The planned PANDA fixed-target experiment will produce up to 2 · 107 antiproton-proton or antiproton-nucleus collisions per second. Up to 8 primary charged particles per event are expected to reach the acceptance of the PANDA Forward Tracking System (FTS) detector. Due to a drift time of ≤ 150 ns for the FTS straw tubes the signals of on average 3 events will overlap in this layered detector at the peak interaction rate of 20 MHz. The number of overlapping events is ≤ 8 with a probability of ≥ 99.6%. In this paper we describe a Hough transform based charged particle tracking algorithm for the PANDA FTS detector. In the region of the PANDA Forward Spectrometer (290 cm ≤ z ≤ 780 cm with the z-axis pointing into the beam direction) we use a 3-stages track model of line+parabola+line for the projection of the track into the bending x-z-plane. The projection into the non-bending y-z-plane is approximated by a line for this region. Preliminary results for single particle momentum resolutions obtained with a proof-of-concept implementation of the described algorithm are presented. Simulations were carried out in PandaRoot, the official framework for simulation, reconstruction and analysis for the PANDA experiment. This work was supported in part by BMBF (05P12RGFPF), HGS-HIRe for FAIR and the LOEWE-Zentrum HICforFAIR.

A Hough Transform Based Pattern Recognition for the PANDA Forward Tracking System