# Interference-assisted detection of dark photon using atomic transitions

## TL;DR

This paper proposes a novel atomic transition-based method for detecting dark photons, leveraging interference effects to improve sensitivity in light-shining-through-a-wall experiments within a specific mass range.

## Contribution

It introduces a new detection scheme for dark photons using atomic transitions that enhances the detection probability through interference effects.

## Key findings

- Potential to set new constraints on dark photon coupling constants.
- Detection probability is first order in coupling due to interference.
- Applicable in the mass range 10^{-3} to 10^{-2} eV.

## Abstract

Dark photon is a massive vector particle which couples to the physical photon through the kinetic mixing term. Such particles, if exist, are produced in photon beams and, in particular, in laser radiation. Due to the oscillations between the physical photon and the dark photon, the latter may be, in principle, detected in the light-shining-through-a-wall experiment. We propose a variant of this experiment where the detection of dark photons is based on the atomic transitions. The key feature of this scheme is that the detection probability is first order in the coupling constant due to the interference term in the photon and dark photon absorption amplitudes. We expect that such experiment may give new constraints on dark photon coupling constant in the mass region $10^{-3}< m < 10^{-2}$ eV.