Coannihilation with a chargino and gauge boson pair production at one-loop
Abstract
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 β.
- Publication:
-
SUSY09: 7th International Conference on Supersymmetry and the Unification of Fundamental Interactions
- Pub Date:
- February 2010
- DOI:
- 10.1063/1.3327540
- arXiv:
- arXiv:0909.3263
- Bibcode:
- 2010AIPC.1200.1067B
- Keywords:
-
- weak interactions (atomic physics);
- boson systems;
- dark matter;
- supersymmetry;
- 12.15.-y;
- 14.70.Pw;
- 95.35.+d;
- 11.30.Pb;
- Electroweak interactions;
- Other gauge bosons;
- Dark matter;
- Supersymmetry;
- High Energy Physics - Phenomenology
- E-Print:
- 4 pages, 5 figures, to appear in the proceedings of the 17th International Conference on Supersymmetry and the Unification of Fundamental Interactions (SUSY09), Boston, USA, 5-10 June, 2009