Coannihilation with a chargino and gauge boson pair production at oneloop
Abstract
We present a complete calculation of the electroweak oneloop 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 higgsinolike. We present some interesting effects which are not present at treelevel and show up at oneloop. To deal with the large number of diagrams occuring in the calculations, we have developed an automatic tool for the computation at oneloop of any process in the MSSM. We have implemented a complete onshell 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 oneloop 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
 EPrint:
 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, 510 June, 2009