Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-09-17
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 5 figures, to appear in the proceedings of the 17th International Conference on Supersymmetry and the Unification of
Scientific paper
We present a complete calculation of the electroweak one-loop corrections to the relic density within the MSSM framework. In the context of the neutralino as dark matter candidate, we review different scenarios of annihilation and coannihilation with a chargino. In particular we investigate predictions for the annihilation into gauge boson pairs for different kinds of neutralino: bino-, wino- and higgsino-like. We present some interesting effects which are not present at tree-level and show up at one-loop. To deal with the large number of diagrams occuring in the calculations, we have developed an automatic tool for the computation at one-loop of any process in the MSSM. We have implemented a complete on-shell gauge invariant renormalization scheme, with the possibility of switching to other schemes. We emphasize the variations due to the choice of the renormalization scheme, in particular the one-loop definition of the parameter tan(beta).
Baro N.
Chalons Guillaume
Hao Sun
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