Leptophilic Dark Matter in Lepton Interactions at LEP and ILC

Understand

Dark matter particles that couple primarily to leptons are only weakly constrained by data from direct detection experiments and the LHC.

• However, models of this kind necessarily generate effective four-lepton contact interactions at the tree- or one-loop-level, which can be probed in $e^+e^-$ collisions.
• In this work, precise data from LEP is used to derive limits on leptophilic dark matter in a model-independent framework.
• The bounds turn out to be competitive with, and in some cases exceed, limits from mono-photon events.