A Leptonic ALP Portal to the Dark Sector

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.

12 pages, 5 figures; v2: some clarifications and references added; conclusions unchanged; version published in PRD

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Cited by in corpus (11)

• Lepton-Flavor-Violating ALP Signals with TeV-Scale Muon Beams
• Sub-GeV dark matter and nano-Hertz gravitational waves from a classically conformal dark sector
• The Muon Magnetic Moment and Physics Beyond the Standard Model
• Revisiting for maximal flavor violating $Z_{e\mu }^{{}^{\prime }}$ and its phenomenology constraints
• Resonant ALP-Portal Dark Matter Annihilation as a Solution to the $B^{\pm }\to K^{\pm }\nu \bar{\nu }$ Excess
• Axion-Like Particle Mediated Dark Matter and Neutron Star Properties in the QHD Model
• Axion Portal to Scalar Dark Matter: Unveiling Stabilizing Symmetry Footprints
• Bounds on ALP-Mediated Dark Matter Models from Celestial Objects
• Axi-Higgs portal Dark Matter via Wess-Zumino mechanism
• Neutron stars can shine a light on elusive lepton-flavor-violating dark matter
• Probing ALP-portal fermionic dark matter at the $e^{+}{e}^{-}$ colliders