Search for semi-annihilating dark matter with Fermi-LAT, H.E.S.S., Planck, and the Cherenkov Telescope Array
Abstract
Dark matter annihilations have been fiercely restricted by the non-observation of excess events in indirect detection probes. Typically the interactions that dictate annihilation are also present in the dark matter-nucleon scattering cross section, also severely constrained by direct detection experiments. Semi-annihilations arise as a possible way to ameliorate the tension and even change the standard dark matter relic density calculation. In this work, we derive indirect detection bounds for several semi-annihilation channels including gauge bosons, the Higgs, leptophilic and leptophobic scalars. Our analysis is based on the gamma-ray observations in the direction of Dwarf Spheroidal Galaxies (Fermi-LAT) and the Galactic Center (H.E.S.S.), and Planck measurements of Cosmic Background Radiation. In addition, we derive the prospects for the Cherenkov Telescope Array (CTA) sensitivity to all these semi-annihilation modes.
- Publication:
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Journal of Cosmology and Astroparticle Physics
- Pub Date:
- April 2019
- DOI:
- 10.1088/1475-7516/2019/04/048
- arXiv:
- arXiv:1901.10494
- Bibcode:
- 2019JCAP...04..048Q
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- 18 pages, 8 figures, version accepted for publication in JCAP