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1994
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L. Bergström, Phys. Lett. B 225
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Earlier work this paper cites.

Similar

P. Ciafaloni, D. Comelli, A. Riotto, F. Sala, A. Strumia, A. Urbano, JCAP 1103
Original
2011
Cited alongside, same era.
P. Ciafaloni, M. Cirelli, D. Comelli, A. De Simone, A. Riotto, A. Urbano, JCAP 1106
Original
2011
Cited alongside, same era.

Then

M. Garny, A. Ibarra, S. Vogl, JCAP 1107
Original
2011
Later among the works it cites.
P. Ciafaloni, M. Cirelli, D. Comelli, A. De Simone, A. Riotto, A. Urbano, JCAP 1110
Original
2011
Later among the works it cites.

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2012

Electroweak lights from Dark Matter annihilations

De Simone, Andrea

Understand

The energy spectra of Standard Model particles originated from Dark Matter annihilations can be significantly altered by the inclusion of electroweak gauge boson radiation from the final state.

A situation where this effect is particularly important is when a Majorana Dark Matter particle annihilates 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.