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L. Bergstrom, Phys. Lett. B225
1989
Earlier work this paper cites.
V. Barger, Y. Gao, W. Y. Keung, D. Marfatia, Phys. Rev. D 80
Original
2009
Earlier work this paper cites.

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E. Ma, Phys. Rev. D 79
Original
2009
Cited alongside, same era.
For a recent review see G. Bertone, (ed.), “Particle dark matter: Observations, models and searches,” Cambridge, UK: Univ. Pr. (2010) 738 p
2010
Cited alongside, same era.

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T. Bringmann, L. Bergstrom, J. Edsjo, JHEP 0801
Original
2010
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2011

Bremsstrahlung in dark matter annihilation

Barger, Vernon, Keung, Wai-Yee, Marfatia, Danny

Understand

We show that the energy spectra from dark matter (DM) annihilation into $f^+f^-\gamma$ (where $f$ is a light fermion) via chirality preserving interactions are identical in 3 scenarios: (a) DM is a Majorana fermion and the particle exchanged is a scalar, (b) DM is a Majorana fermion and the particle exchanged is a vector and (c) DM is a scalar and the particle exchanged is a fermion.

For cases (a) and (c), we also calculate the differential cross section to $\ell^+f^-V$, where $V=W,Z,\gamma$, and $\ell$ is a light fermion that may or not be the same as $f$.
The form of the cross section depends on whether the DM is a Majorana fermion or a scalar but in both cases its form is independent of $V$.