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Axionlike Particles, Lepton-Flavor Violation, and a New Explanation of aμ and a

Bauer, Martin; Neubert, Matthias; Renner, Sophie; Schnubel, Marvin; Thamm, Andrea

Axionlike Particles, Lepton-Flavor Violation, and a New Explanation of aμ and a Thumbnail


Authors

Matthias Neubert

Sophie Renner

Marvin Schnubel

Andrea Thamm



Abstract

Axionlike particles (ALPs) with lepton-flavor-violating couplings can be probed in exotic muon and tau decays. The sensitivity of different experiments depends strongly on the ALP mass and its couplings to leptons and photons. For ALPs that can be resonantly produced, the sensitivity of three-body decays such as μ → 3e and τ → 3μ exceeds by many orders of magnitude that of radiative decays like μ → eγ and τ → μγ. Searches for these two types of processes are therefore highly complementary. We discuss experimental constraints on ALPs with a single dominant lepton-flavor-violating coupling. Allowing for one or more such couplings offers qualitatively new ways to explain the anomalies related to the magnetic moments of the muon or the electron. The explanation of both anomalies requires lepton-flavornonuniversal or lepton-flavor-violating ALP couplings.

Citation

Bauer, M., Neubert, M., Renner, S., Schnubel, M., & Thamm, A. (2020). Axionlike Particles, Lepton-Flavor Violation, and a New Explanation of aμ and a. Physical Review Letters, 124(21), Article 211803. https://doi.org/10.1103/physrevlett.124.211803

Journal Article Type Article
Acceptance Date Apr 30, 2020
Online Publication Date May 28, 2020
Publication Date May 29, 2020
Deposit Date Jun 3, 2020
Publicly Available Date Mar 28, 2024
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 124
Issue 21
Article Number 211803
DOI https://doi.org/10.1103/physrevlett.124.211803

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http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.





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