Searching for a dark matter coupling to the Standard Model with a Stueckelberg extension

TL;DR

This paper explores a theoretical extension of the Standard Model involving a new Z' boson and a dark photon-like A' particle, analyzing their properties and constraints relevant to dark matter interactions.

Contribution

It introduces a novel double extension to the Standard Model with a Stueckelberg mechanism, highlighting the properties of a massless dark photon-like A' and its implications for dark matter.

Findings

A massless dark photon-like A' is predicted in the model.

Constraints on Z' mass and Z boson mass corrections are derived.

The model provides a framework for dark matter coupling to the Standard Model.

Abstract

We investigate a double extension to the Standard Model (SM). A first extension introduces, via minimal coupling, a massive $Z'$ boson. This enlarged SM is coupled to a dark matter sector through the Stueckelberg mechanism by a $A'$ boson. However, the $A'$ boson does not interact directly with the SM fermions. In our study, we found that the $A'$ is a massless photon-like particle in dark sector. Constraints on the mass for $Z'$ and corrections to $Z$ mass are obtained.