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 and dominantly through 2-loop Barr-Zee diagrams, while the DM abundance is generated by -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.
Keywords
Cite
@article{arxiv.2310.05827,
title = {A Leptonic ALP Portal to the Dark Sector},
author = {Giovanni Armando and Paolo Panci and Joachim Weiss and Robert Ziegler},
journal= {arXiv preprint arXiv:2310.05827},
year = {2024}
}
Comments
12 pages, 5 figures; v2: some clarifications and references added; conclusions unchanged; version published in PRD