Dark Photons, Kinetic Mixing and Light Dark Matter From 5-D

TL;DR

This paper explores how extending dark photon and scalar dark matter models to five dimensions can address tuning issues and produce phenomenology relevant to current experiments.

Contribution

It introduces a 5-D framework for dark photon and dark matter interactions, offering new insights and potential solutions to tuning problems in 4-D models.

Findings

5-D models can mitigate tuning issues present in 4-D models

The inverse size of the extra dimension is in the 10-1000 MeV range

Phenomenological implications align with current experimental sensitivities

Abstract

Extra dimensions provide a unique tool for building new physics models. Here we extend the kinetic mixing/dark photon mediator scenario for the case of complex scalar dark matter interacting with the Standard Model to 5-D. We assume that the inverse size of the new, flat extra dimension is $\sim 10 - 1000$ MeV, the mass range of interest in numerous current experiments, and discuss the resulting phenomenology. Here we see that 5-D constructions can be used to soften some of the possible tuning issues which are sometimes encountered in the corresponding 4-D models.