Speaker
Dr
Andrea De Simone
(EPFL)
Description
Recent analyses have shown that the inclusion of electroweak corrections can alter significantly the energy spectra of Standard Model particles originated from dark matter annihilations. I will consider the important situation where the radiation of electroweak gauge bosons has a substantial influence: a Majorana dark matter particle annihilating into two light fermions. This process is in p-wave and hence suppressed by the small value of the relative velocity of the annihilating particles. The inclusion of electroweak radiation eludes this suppression and opens up a potentially sizeable s-wave contribution to the annihilation cross section. I will describe this effect in detail and discuss its impact on the fluxes of stable particles resulting from the dark matter annihilations, which are relevant for dark matter indirect searches. I will also comment on the effective field theory approach, pointing out that the opening of the s-wave is missed at the level of dimension-six operators and only encoded by higher orders.
Author
Dr
Andrea De Simone
(EPFL)
Co-authors
Mr
Alfredo Urbano
(University of Lecce)
Dr
Antonio Riotto
(CERN)
Dr
Denis Comelli
(INFN - Ferrara)
Dr
Marco Cirelli
(CEA/Saclay and CERN)
Dr
Paolo Ciafaloni
(University of Lecce)
