Coannihilation with a chargino and gauge boson pair production at one-loop - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2009

Coannihilation with a chargino and gauge boson pair production at one-loop

Résumé

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).

Dates et versions

hal-00612261 , version 1 (28-07-2011)

Identifiants

Citer

N. Baro, G. Chalons, Sun Hao. Coannihilation with a chargino and gauge boson pair production at one-loop. 2009. ⟨hal-00612261⟩
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