Axion dark matter from lepton flavor-violating decays

Paolo Panci, Diego Redigolo, Thomas Schwetz, Robert Ziegler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We propose simple scenarios where lepton flavor-violating couplings generate the observed dark matter abundance through freeze-in of an axion-like particle with mass in the few keV range. Compared to flavor-diagonal freeze-in, this mechanism enhances dark matter stability, softens stellar cooling constraints and improves the experimental sensitivity of accelerator-based searches. These scenarios can be tested by future X-ray telescopes, and in some cases will be almost entirely probed by new searches for lepton flavor violation at high-intensity experiments such as Mu3e and MEG II.

Original languageEnglish
Article number137919
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - 10 Jun 2023
Externally publishedYes


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