Search for Muon-to-Electron Conversion with the COMET Experiment
Search for Muon-to-Electron Conversion with the COMET Experiment
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DOI：
10.3390/universe8040196
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发表时间：
2022-03
期刊：
影响因子：
2.9
通讯作者：
M. Moritsu
中科院分区：
文献类型：
--
作者：
M. Moritsu
带电轻子风味违反预计将是揭示标准模型以外的物理的最强大的工具之一。彗星实验旨在寻找原子核场中无中微子到电子的相干跃迁。我们从来没有观察到过从介子到电子的转换，如果发现的话，它可能是，也将是新物理的明确证据。这一过程的实验灵敏度--定义为Muon-to-Electronics转换率与总Muon捕获率的比率--预计在未来十年将显著提高100至10,000倍。彗星实验将在J-PARC进行，第一阶段和第二阶段的单粒子灵敏度分别为10−15和10−17数量级。彗星实验的雄心勃勃的目标是通过实现高质量的脉冲光束和空前强大的Muon源，以及能够耐受恶劣辐射环境的优秀探测器设备来实现的。建造新的束线、超导磁铁、探测器和电子学的工作正在进行中，以迎接即将到来的第一阶段实验。我们介绍了实验方法、灵敏度和背景，以及研究现状和前景。
Charged Lepton Flavor Violation is expected to be one of the most powerful tools to reveal physics beyond the Standard Model. The COMET experiment aims to search for the neutrinoless coherent transition of a muon into an electron in the field of a nucleus. Muon-to-electron conversion has never been observed, and can be, and would be, clear evidence of new physics if discovered. The experimental sensitivity of this process, defined as the ratio of the muon-to-electron conversion rate to the total muon capture rate, is expected to be significantly improved by a factor of 100 to 10,000 in the coming decade. The COMET experiment will take place at J-PARC with single event sensitivities of the orders of 10−15 and 10−17 in Phase-I and Phase-II, respectively. The ambitious goal of the COMET experiment is achieved by realizing a high-quality pulsed beam and an unprecedentedly powerful muon source together with an excellent detector apparatus that can tolerate a severe radiation environment. The construction of a new beam line, superconducting magnets, detectors and electronics is in progress towards the forthcoming Phase-I experiment. We present the experimental methods, sensitivity and backgrounds along with recent status and prospects.