We calculate the O(α) corrections to the annihilation cross section for dark matter candidates in the minimal supersymmetric standard model. In particular, the radiative process χχ→qqg is shown to be at most 15% of the total cross sections (except for very massive binos). We apply our results to the relic abundance of neutralinos left over in the Big Bang. We also comment on the importance of these channels for dark matter annihilation in the galactic halo.
Bibliographical noteFunding Information:
The work of Keith A. Olive and Serge Rudaz was supported in part by DOE grant AC02-83ER-40105 at the University of Minnesota and by Presidential Young Investigator Awards.