Track Reconstruction for the COMET Drift Chamber

The COMET experiment is designed to search for charged lepton flavor violation (CLFV) through coherent muon-to-electron conversion, characterized by a 105 MeV electron signal. In Phase I, an all‑stereo‑layer Cylindrical Drift Chamber (CDC) is used as the main tracker for charged‑particle measurement. A key challenge is that all the signal tracks are curled and about one‑third of the tracks in the CDC are multi‑turn, which complicates both track finding and fitting. Furthermore, owing to the high luminosity of the experiment, tracking performance is challenged by high hit occupancy.

We present the track‑reconstruction pipeline developed for the COMET Phase‑I CDC. Our approach employs multiple track‑finding algorithms to identify track candidates. For track fitting, with an emphasis on multi‑turn trajectories, we describe an enhanced algorithm based on the Genfit toolkit. The performance of the full reconstruction chain will also be discussed.