We discuss the leptonic axionlike particle (ALP) portal as a simple scenario that connects observed discrepancies in anomalous magnetic moments to the dark matter relic abundance. In this framework an axionlike particle in the multi-MeV range couples to SM leptons and a dark matter (DM) fermion, with mass above the ALP mass but below 1 GeV. The ALP contributes to (𝑔−2)𝜇 and (𝑔−2)𝑒 dominantly through two-loop Barr-Zee diagrams, while the DM abundance is generated by 𝑝-wave annihilation to ALP pairs. Constraints from beam-dump experiments, colliders, and cosmic microwave background probes are very stringent, and restrict the viable parameter space to a rather narrow region that will be tested in the near future.
Leptonic ALP portal to the dark sector
Armando, Giovanni;Panci, Paolo
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2024-01-01
Abstract
We discuss the leptonic axionlike particle (ALP) portal as a simple scenario that connects observed discrepancies in anomalous magnetic moments to the dark matter relic abundance. In this framework an axionlike particle in the multi-MeV range couples to SM leptons and a dark matter (DM) fermion, with mass above the ALP mass but below 1 GeV. The ALP contributes to (𝑔−2)𝜇 and (𝑔−2)𝑒 dominantly through two-loop Barr-Zee diagrams, while the DM abundance is generated by 𝑝-wave annihilation to ALP pairs. Constraints from beam-dump experiments, colliders, and cosmic microwave background probes are very stringent, and restrict the viable parameter space to a rather narrow region that will be tested in the near future.File | Dimensione | Formato | |
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PhysRevD.109.055029-2.pdf
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