Mono-W Dark Matter Signals at the LHC: Simplified Model Analysis

Understand

We study mono-W signals of dark matter (DM) production at the LHC, in the context of gauge invariant renormalizable models.

• We analyze two simplified models, one involving an s-channel Z' mediator and the other a t-channel colored scalar mediator, and consider examples in which the DM-quark couplings are either isospin conserving or isospin violating after electroweak symmetry breaking.
• While previous work on mono-W signals have focused on isospin violating EFTs, obtaining very strong limits, we find that isospin violating effects are small once such physics is embedded into a gauge invariant simplified model.
• We thus find that the 8 TeV mono-W results are much less constraining than those arising from mono-jet searches.