Abstract
We propose some scenarios to pursue dark matter searches at the LHC in a fairly model-independent way. The first benchmark case is dark matter co-annihilations with coloured particles (gluinos or squarks being special examples). We determine the masses that lead to the correct thermal relic density including, for the first time, strong Sommerfeld corrections taking into account colour decomposition. In the second benchmark case we consider dark matter that couples to SM particles via the Z or the Higgs. We determine the couplings allowed by present experiments and discuss future prospects. Finally we present the case of dark matter that freezes out via decays and apply our results to invisible Z and Higgs decays.
Highlights
O√verestimate the DM signal, because of spurious enhancements proportional to powers of s/Λ
We determine the masses that lead to the correct thermal relic density including, for the first time, strong Sommerfeld corrections taking into account colour decomposition
Invisible BR suggested by DM thermal relic abundance
Summary
We consider the possibility that the DM particle, stabilized by a discrete symmetry, is accompanied by a nearby coloured state χ , either in the triplet or octet representation of SU(3)c, which can be either a scalar or a fermion. Since we neglect any interaction between the SM and dark sectors, other than strong interactions, there are only two parameters relevant for our analysis: the DM mass MDM and the mass splitting ∆M of χ with respect to the DM
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