Volume 142, Number 1, April 2023
|Number of page(s)
|Nuclear and plasma physics, particles and fields
|30 March 2023
Annihilation of singlet fermionic dark matter into two photons via pseudo-scalar mediator
Department of Physics, University of Qom - Ghadir Blvd., Qom 371614-6611, I.R. Iran
Received: 25 September 2022
Accepted: 21 March 2023
We consider the indirect detection of dark matter within an extension of the standard model (SM) including a singlet fermion as cold dark matter (CDM) and a singlet pseudo-scalar as a mediator between dark matter and the SM particles. The annihilation cross-section of the CDM into two monochromatic photons is calculated and compared with the latest H.E.S.S. data. Although for dark matter masses below 1 TeV the predicted observable cross-sections are far from the sensitivity of the recent gamma-ray experiments, it can be comparable to the strongest H.E.S.S. upper bounds for some models with more massive CDM.
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