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Free keywords:
High Energy Physics - Phenomenology, hep-ph,High Energy Physics - Experiment, hep-ex
Abstract:
We propose a minimal UV-complete model for kinematically forbidden Dark
Matter (DM) leading to a sub-GeV thermal relic. Our crucial realization is that
the two-Higgs-doublet model can provide a light mediator through which the DM
can annihilate into SM leptons, avoiding indirect detection constraints. The DM
mass is predicted to be very close to the mass of the leptons, which can
potentially be identified from DM annihilation into gamma-rays. Due to sizable
couplings to muons in reproducing the DM relic abundance, this framework
naturally favors a resolution to the $(g-2)_\mu$ anomaly. Furthermore, by
embedding this setup to the Zee model, we show that the phenomenon of neutrino
oscillations is inherently connected to the observed relic abundance of DM. All
new physics involved in our framework lies at or below the electroweak scale,
making it testable at upcoming colliders, beam-dump experiments, and future
sub-GeV gamma-ray telescopes.
