Speaker
Dr
Camilo Alfredo Garcia Cely
(ULB)
Description
The observation of line-like signals of high-energy gamma rays is considered a discovery channel of dark matter.
Nevertheless, calculating the rate and the spectral shape associated to these processes is highly non-trivial and depends on the details of the underlying dark matter model.
I will argue that, in spite of this situation, there are a number of model-independent statements that can be drawn.
First, I will show that angular momentum considerations determine to a large extend the spectral features arising in dark matter annihilations into intermediary particles which subsequently produce photons via two-body decays. I illustrate this with the gamma-ray spectra generated by dark matter annihilating into hypothetical diphoton resonances.
If time allows, I will then discuss a systematic classification of the one-loop diagrams leading to dark matter annihilations into photon lines in an arbitrary model. I will argue that such classification can be used to greatly simplify the calculation of the corresponding cross sections.
Primary author
Dr
Camilo Alfredo Garcia Cely
(ULB)
