4.4 Article

Forbidden dark matter annihilations into Standard Model particles

Journal

JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 6, Pages -

Publisher

SPRINGER
DOI: 10.1007/JHEP06(2021)103

Keywords

Beyond Standard Model; Cosmology of Theories beyond the SM

Funding

  1. NSF CAREER grant [PHY-1554858]
  2. NSF [PHY-1915409]
  3. Alexander von Humboldt Foundation
  4. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC 2121, 390833306]

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The authors present a mechanism of kinematically forbidden dark matter annihilations into Standard Model leptons, which precisely selects the dark matter mass that gives the observed relic abundance. This mechanism differs qualitatively from existing models of thermal dark matter, where fixing the relic density typically leaves open orders of magnitude of viable dark matter masses.
We present kinematically forbidden dark matter annihilations into Standard Model leptons. This mechanism precisely selects the dark matter mass that gives the observed relic abundance. This is qualitatively different from existing models of thermal dark matter, where fixing the relic density typically leaves open orders of magnitude of viable dark matter masses. Forbidden annihilations require the dark matter to be close in mass to the particles that dominate its annihilation rate. We show examples where the dark matter mass is close to the muon mass, the tau mass, or the average of the tau and muon masses. We find that most of the relevant parameter space can be covered by the next generation of proposed beam-dump experiments and future high-luminosity electron positron colliders. Forbidden dark matter predicts large couplings to the Standard Model that can explain the observed value of (g - 2)(mu).

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