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Axionlike particles, lepton-flavor violation, and a new explanation of aμ and a.

Bauer, Martin and Neubert, Matthias and Renner, Sophie and Schnubel, Marvin and Thamm, Andrea (2020) 'Axionlike particles, lepton-flavor violation, and a new explanation of aμ and a.', Physical review letters., 124 (21). p. 211803.


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.

Item Type:Article
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Publisher 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.
Date accepted:30 April 2020
Date deposited:03 June 2020
Date of first online publication:28 May 2020
Date first made open access:03 June 2020

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