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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2508.15344 |
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| _version_ | 1866913999704031232 |
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| author | Moritsu, Manabu Li, Hai-Bo Xing, Tianyu Yuan, Ye Zhang, Yao |
| author_facet | Moritsu, Manabu Li, Hai-Bo Xing, Tianyu Yuan, Ye Zhang, Yao |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_15344 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A study to suppress a sneaking cosmic muon background in the COMET experiment Moritsu, Manabu Li, Hai-Bo Xing, Tianyu Yuan, Ye Zhang, Yao High Energy Physics - Experiment Instrumentation and Detectors 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. |
| title | A study to suppress a sneaking cosmic muon background in the COMET experiment |
| topic | High Energy Physics - Experiment Instrumentation and Detectors |
| url | https://arxiv.org/abs/2508.15344 |