# Bonn 2020 – wissenschaftliches Programm

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# HK: Fachverband Physik der Hadronen und Kerne

## HK 20: Instrumentation III

### HK 20.1: Vortrag

### Dienstag, 31. März 2020, 17:00–17:15, J-HS C

Optimization of a PANDA track finding algorithm based on the Apollonius problem — •Anna Scholl, Tobias Stockmanns, and James Ritman — Forschungszentrum Jülich

This work presents a track finding algorithm for the barrel part of the PANDA Straw Tube Tracker (STT).
It consists of over 4200 gas-filled drift tubes arranged in a dense packing.
The STT hits are not point-like, but tubes (isochrones) around the center of the straw tubes resulting from the measured drift time of the electrons to the anode.
The track of the charged particle must pass tangentially to the isochrone.

Algorithms based on two or three dimensional hitpoints usually do not use the additional isochrone information.
For the STT, however, a tracking algorithm is needed that finds tracks that are tangential to every isochrone.
To deal with this challenge, this work presents an approach based on the Apollonius problem, which is a mathematical solution to find a circle that is tangential to three other circles.
This mathematical description is the basis for a Hough transformation to find the track of the charged particle.

To improve the performance of the Hough transform, the results from several different data preselection methods will be presented.
Another challenge the algorithm needs to deal with is that the particle tracks are not perfectly continuous, but there may also be losses of hits or noise.
Therefore a merging algorithm was implemented to combine different tracklets to a track.
A more detailed description and first results of the algorithm described above will be shown.