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Resonant pseudo-Dirac dark matter as a sub-GeV thermal target

Nirmalya Brahma, Saniya Heeba, and Katelin Schutz

  • Department of Physics and Trottier Space Institute, McGill University, Montréal, QC H3A 2T8, Canada

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Phys. Rev. D 109, 035006 – Published 8 February, 2024

DOI: https://doi.org/10.1103/PhysRevD.109.035006

Abstract

Dark matter (DM) could be a pseudo-Dirac thermal relic with a small mass splitting that is coupled off diagonally to a kinetically mixed dark photon. This model, particularly in the sub-GeV mass range, is a key benchmark for accelerator searches and direct detection experiments. Typically, the presence of even a tiny fraction of pseudo-Dirac DM in the excited state around the time of recombination would be excluded by DM annihilation bounds from the cosmic microwave background (CMB); thus, viable thermal histories must typically feature an exponential suppression of the excited state. We revisit assumptions about the thermal history in the resonant regime, where the dark photon mass is slightly more than twice the DM mass (to within ∼10%), leading to an s-channel resonance in the annihilation cross section. This resonance substantially reduces the couplings required for achieving the observed relic abundance, implying that in much of the parameter space, the DM kinetically decouples from the Standard Model well before the final DM relic abundance is achieved. We find that the excited state is not thermally depopulated in this regime. In spite of this, we find that the presence of the excited state does not violate CMB bounds, even for arbitrarily small mass splittings. The present-day abundance of the excited state opens up the possibility of signatures that are usually not relevant for pseudo-Dirac DM, including indirect detection, direct detection, and self-interacting DM signatures.

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Phys. Rev. D 109, 035006– Published 8 February, 2024
  • Received 11 August 2023
  • Accepted 2 January 2024
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