Minimal dark matter
Wed, Oct. 18th 2006, 14:15
Salle Claude Itzykson, Bât. 774, Orme des Merisiers
The Dark Matter problem calls for new physics, likely in the form of a cosmologically stable, electrically neutral, weakly interacting particle with a mass around the TeV scale. Many 'beyond the Standard Model' constructions (most notably SuperSymmetry) provide plausible candidates as a by-product of more ambitious goals, but these often have an obscure phenomenology (due to the large number of unknown parameters) and an ad hoc mechanism is necessary to explain their stability on cosmological scales (e.g. R-parity in SuSy). We explore therefore a more minimalistic approach: on top of the Standard Model, we only introduce fermionic or scalar multiplets with SM gauge interactions and we look for good DM candidates. We find indeed some fully successful candidates. Remarkably, their stability is automatically guaranteed by renormalizability, like proton stability. For these candidates, we compute precisely the mass, the cross section for direct detection in future experiments and the distinctive phenomenology at colliders.