Status of Dark Photons

TL;DR

This paper reviews recent progress in dark photon research, covering theoretical models, experimental searches, and constraints, with emphasis on different mass generation mechanisms and their implications.

Contribution

It provides a comprehensive overview of dark photon models, including distinctions between mass types, theoretical constraints, and new experimental approaches.

Findings

Analysis of Higgs vs. Stueckelberg mass mechanisms

Discussion of swampland constraints and UV completions

Overview of emerging experimental search strategies

Abstract

I review recent developments in the field of dark photons-here taken to be U(1) gauge bosons with mass less than the Z-including both kinetically mixed vectors and those that couple to anomaly-free U(1)'s. Distinctions between Higgs and Stueckelberg masses are highlighted, with discussion of swampland constraints, UV completions, and new experimental search strategies.