Hidden Dipole Dark Matter

TL;DR

This paper explores hidden dipole dark matter models with kinetic mixing, focusing on higher dimension operators that evade direct detection but remain testable through collider searches, offering new insights into dark matter interactions.

Contribution

It introduces models where dark matter interacts via higher dimension operators with a hidden U(1)', providing a novel framework that explains null direct detection results while remaining accessible to collider experiments.

Findings

Models naturally suppress direct detection signals.

LHC Z' searches are effective probes.

Dark matter can have a thermal cosmology.

Abstract

We consider models where a hidden U(1)' interacts with the Standard Model via kinetic mixing. We assume the dark matter is neutral under this U(1)', but interacts with it via higher dimension operators. In particular, we consider a hidden dipole operator for fermionic dark matter, and charge radius and Rayleigh operators for scalar dark matter. These models naturally explain the absence of direct detection signals, but allow for a thermal cosmology. LHC searches for the Z' represent a powerful probe.