@inbook{doi:10.7566/JPSCP.45.011192,

title = {A Study to Suppress a Sneaking Cosmic Muon Background in the COMET Experiment},
booktitle = {Proceedings of the 4th J-PARC Symposium 2024},
chapter = {},
pages = {},
doi = {10.7566/JPSCP.45.011192},
URL = {https://journals.jps.jp/doi/abs/10.7566/JPSCP.45.011192},
eprint = {https://journals.jps.jp/doi/pdf/10.7566/JPSCP.45.011192},
    abstract = { The COMET experiment, conducted at J-PARC, aims to search for muon-to-electron conversion with an unprecedentedly high sensitivity. One of the severest backgrounds in the Phase-I experiment originates from cosmic-ray muons. A cosmic muon sneaks into a detector solenoid magnet from a loophole, scattered and leaving a track in a cylindrical drift chamber. Among them, a positive muon track with reverse direction may mimic a signal electron of 105 MeV/\(c\). In order to suppress the sneaking cosmic positive muon background, we developed a method to discriminate the track direction by using track-fitting quality. We demonstrated that the positive muon background can be reduced by an order of magnitude. In this paper, we will report the methodology, a Monte Carlo simulation and results with prospects. }
}