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Paper detail

On the effective operators for Dark Matter annihilations

We consider effective operators describing Dark Matter (DM) interactions with Standard Model fermions. In the non-relativistic limit of the DM field, the operators can be organized according to their mass dimension and their velocity behaviour, i.e. whether they describe s- or p-wave annihilations. The analysis is carried out for self-conjugate DM (real scalar or Majorana fermion). In this case, the helicity suppression at work in the annihilation into fermions is lifted by electroweak bremsstrahlung. We construct and study all dimension-8 operators encoding such an effect. These results are of interest in indirect DM searches.

preprint2013arXivOpen access
Andrea De SimoneAlexander MoninAndrea ThammAlfredo Urbano
hep-ph
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Andrea De SimoneAlexander MoninAndrea ThammAlfredo Urbano

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