In the small-coupling limit of the singlet-doublet dark matter model, the relic density is set by co-scattering, freeze-in, or SuperWIMP decays rather than ordinary freeze-out, and the observable signals move from direct detection to long-lived particle searches at colliders.
Search for inelastic dark matter in events with two displaced muons and missing transverse momentum in proton-proton collisions at $\sqrt{s}$ = 13 TeV
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abstract
A search for dark matter in events with a displaced nonresonant muon pair and missing transverse momentum is presented. The analysis is performed using an integrated luminosity of 138 fb$^{-1}$ of proton-proton (pp) collision data at a center-of-mass energy of 13 TeV produced by the LHC in 2016-2018. No significant excess over the predicted backgrounds is observed. Upper limits are set on the product of the inelastic dark matter production cross section $\sigma$(pp $\to$ A' $\to$ $\chi_1$ $\chi_2$) and the decay branching fraction $\mathcal{B}$($\chi_2$ $\to$ $\chi_1 \mu^+ \mu^-$), where A' is a dark photon and $\chi_1$ and $\chi_2$ are states in the dark sector with near mass degeneracy. This is the first dedicated collider search for inelastic dark matter.
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Singlet-doublet dark matter beyond freeze-out
In the small-coupling limit of the singlet-doublet dark matter model, the relic density is set by co-scattering, freeze-in, or SuperWIMP decays rather than ordinary freeze-out, and the observable signals move from direct detection to long-lived particle searches at colliders.