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arXiv · 2310.05827

A Leptonic ALP Portal to the Dark Sector

Giovanni Armando·Paolo Panci·Joachim Weiss·Robert Ziegler
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Abstract

We discuss the leptonic ALP portal as a simple scenario that connects observed discrepancies in anomalous magnetic moments to the Dark Matter relic abundance. In this framework an axion-like particle in the multi-MeV range couples to SM leptons and a DM fermion, with mass above the ALP mass but below a GeV. The ALP contributes to $(g-2)_\mu$ and $(g-2)_e$ dominantly through 2-loop Barr-Zee diagrams, while the DM abundance is generated by $p$-wave annihilation to ALP pairs. Constraints from beam-dump experiments, colliders and CMB probes are very stringent, and restrict the viable parameter space to a rather narrow region that will be tested in the near future.

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Giovanni Armando, Paolo Panci, Joachim Weiss, Robert Ziegler. 2023-10-09. A Leptonic ALP Portal to the Dark Sector. https://doi.org/10.1103/physrevd.109.055029

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