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Thermal Dark Photon Dark Matter, Coscattering, and Long-lived ALPs
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abstract
We study the thermal freeze-out of a dark photon dark matter in the so-called dark-axion portal - a triple coupling among a dark photon, an axion-like particle and the SM $\gamma$ or $Z$ boson. We analyze in detail the thermal production regimes: coscattering (aka conversion driven freeze-out), mediator freeze-out, and coannihilations. We found viable DM scenarios fulfilling the correct relic abundance in the three regimes. Apart of analyzing the parameter space for dark state masses between the GeV-TeV scale, we explore the prospects of having the axion-like field as a long-lived particle, possibly to be observed at the LHC and future detectors.
Forward citations
Cited by 2 Pith papers
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Coscattering Dark Matter in the Inverse Scotogenic Models
In the inverse scotogenic model, nearly degenerate Z2-odd scalars φ1 and φ2 produce the observed dark matter relic density via coscattering through either the Higgs portal or Yukawa portal, with long-lived φ2 decays g...
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Reviving $Z^\prime$ Portal Dark Matter with Conversion Mechanism
In a U(1)_{B-L} Z' portal model with two nearly degenerate dark fermions, the conversion mechanism can produce the observed dark matter relic density while evading current collider and direct-detection constraints.
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