Search for muon-to-electron conversion with the COMET experiment

Abstract

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.

arXiv commentReview, 18 pages, 10 figures, 2 tables, published version

References in corpus (21)

• Muon Decay and Physics Beyond the Standard Model
• Detailed calculation of lepton flavor violating muon-electron conversion rate for various nuclei
• Charged Lepton Flavor Violation: An Experimenter's Guide
• COMET Phase-I Technical Design Report
• Renormalisation-group improved analysis of $\mu \to e$ processes in a systematic effective-field-theory approach
• On the model discriminating power of mu -> e conversion in nuclei
• Mu2e Technical Design Report
• Muon decay in orbit: spectrum of high-energy electrons
• MuSIC: delivering the world's most intense muon beam
• Selecting mu -> e Conversion Targets to distinguish Lepton Flavour-Changing Operators
• A new idea to search for charged lepton flavor violation using a muonic atom
• Probing $\mu e\gamma \gamma$ contact interactions with $\mu \to e$ conversion
• COMET - A submission to the 2020 update of the European Strategy for Particle Physics on behalf of the COMET collaboration
• Improved analyses for ${\mu }^{-}{e}^{-}\to e^{-}{e}^{-}$ in muonic atoms by contact interactions
• Improved analysis for ${\mu }^{-}{e}^{-}\to e^{-}{e}^{-}$ in muonic atoms by photonic interaction
• Future Experimental Improvement for the Search of LNV Process in $e\mu$ Sector
• Radiation hardness study for the COMET Phase-I electronics
• Test of a small prototype of the COMET cylindrical drift chamber
• Gigabit Ethernet Daisy-Chain on FPGA for COMET Read-out Electronics
• GPU-Accelerated Event Reconstruction for the COMET Phase-I Experiment
• Data taking network for COMET Phase-I

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