Using CTAO projected line sensitivity, the paper forecasts lower bounds on effective dark matter interaction scales above 10 TeV for TeV mass dark matter, with direct detection dominating the fermionic dipole operator.
Search for Semi-Annihilating Dark Matter with Fermi-LAT, H.E.S.S., Planck, and the Cherenkov Telescope Array
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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.
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Constraining Effective Field Theories for dark matter candidates annihilating into gamma-ray lines with CTAO
Using CTAO projected line sensitivity, the paper forecasts lower bounds on effective dark matter interaction scales above 10 TeV for TeV mass dark matter, with direct detection dominating the fermionic dipole operator.