Projects COSI and AMEGO-X sensitivities to sub-GeV DM in vector-scalar portals, finding COSI leading in some regions beyond CMB limits and AMEGO-X covering most continuum cases.
MeV Dark Matter Complementarity and the Dark Photon Portal
3 Pith papers cite this work. Polarity classification is still indexing.
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abstract
We discuss the phenomenology of an MeV-scale Dirac fermion coupled to the Standard Model through a dark photon with kinetic mixing with the electromagnetic field. We compute the dark matter relic density and explore the interplay of direct detection and accelerator searches for dark photons. We show that precise measurements of the temperature and polarization power spectra of the Cosmic Microwave Background Radiation lead to stringent constraints, leaving a small window for the thermal production of this MeV dark matter candidate. The forthcoming MeV gamma-ray telescope e-ASTROGAM will offer important and complementary opportunities to discover dark matter particles with masses below 10 MeV. Lastly, we discuss how a late-time inflation episode and freeze-in production could conspire to yield the correct relic density while being consistent with existing and future constraints.
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background 1representative citing papers
In a dark-photon-mediated Dirac fermionic DM model, only narrow resonant regions with small dark-sector coupling allow the candidate to saturate the full relic density while evading current direct and indirect detection bounds.
A 22 MeV Dirac dark matter particle in a U(1)_{Lμ-Lτ} model annihilates to muon and tau neutrinos that oscillate to explain the SK excess while matching thermal relic abundance.
citing papers explorer
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Constraining light dark matter in vector-scalar portals with COSI and AMEGO-X
Projects COSI and AMEGO-X sensitivities to sub-GeV DM in vector-scalar portals, finding COSI leading in some regions beyond CMB limits and AMEGO-X covering most continuum cases.
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GeV-scale thermal dark matter from dark photons: tightly constrained, yet allowed
In a dark-photon-mediated Dirac fermionic DM model, only narrow resonant regions with small dark-sector coupling allow the candidate to saturate the full relic density while evading current direct and indirect detection bounds.
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Dark Matter Interpretation of the Super-Kamiokande Antineutrino Excess in $\mathrm{U}(1)_{L_\mu-L_\tau}$ model
A 22 MeV Dirac dark matter particle in a U(1)_{Lμ-Lτ} model annihilates to muon and tau neutrinos that oscillate to explain the SK excess while matching thermal relic abundance.