On Mono-W Signatures in Spin-1 Simplified Models

TL;DR

This paper investigates the limitations of mono-W signatures in spin-1 simplified models for dark matter detection at the LHC, proposing solutions to address unitarity violations affecting sensitivity.

Contribution

The authors identify the unitarity violation issue in mono-W channels and propose three solutions within spin-1 simplified models to improve search reliability.

Findings

Mono-W sensitivity is affected by unitarity violation artifacts.

Three solutions are proposed to mitigate the mono-W problem.

Implications for future LHC dark matter searches are discussed.

Abstract

The potential sensitivity to isospin-breaking effects makes LHC searches for mono-W signatures promising probes of the coupling structure between the Standard Model and dark matter. It has been shown, however, that the strong sensitivity of the mono-W channel to the relative magnitude and sign of the up-type and down-type quark couplings to dark matter is an artefact of unitarity violation. We provide three different solutions to this mono-W problem in the context of spin-1 simplified models and briefly discuss the impact that our findings have on the prospects of mono-W searches at future LHC runs.