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.
Novel Gamma-ray Spectral Features in the Inert Doublet Model
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abstract
The inert doublet model contains a neutral stable particle which is an excellent dark matter candidate. We discuss in this paper the indirect signatures of this model in gamma-rays when the dark matter mass is larger than the $W$ boson mass. We show that, in addition to the featureless gamma-ray spectrum produced in the annihilations into two weak gauge bosons, the model generically predicts a distinctive spectral feature from the internal bremsstrahlung process $H^0 H^0 \rightarrow W^+ W^- \gamma$. We discuss under which conditions the spectral feature is generated and we construct a number of benchmark points, compatible with the observed relic density and all other direct and indirect detection experiments, which lead to a sharp gamma-ray feature from internal bremsstrahlung.
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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.