Dark photon production via $\gamma \gamma \rightarrow \gamma A'$

TL;DR

This paper investigates a new dark photon production method in MeV-scale gamma-gamma colliders, calculating cross sections and setting constraints on dark photon parameters based on background analysis.

Contribution

It introduces a novel production mechanism for dark photons via gamma-gamma collisions and provides detailed cross section calculations and parameter constraints.

Findings

Differential cross sections for gamma gamma to gamma A' are computed.

Constraints on dark photon parameters are established for various collider time intervals.

The study demonstrates the feasibility of probing dark photons in MeV gamma-gamma colliders.

Abstract

The dark photon is a new gauge boson which arises from an extra U'(1) gauge symmetry. In this paper, a novel dark photon production mechanism based on MeV-scale $\gamma$-$\gamma$ collider is considered: $\gamma \gamma \rightarrow \gamma A'$. With the aid of PACKAGE-X, differential cross section of $\gamma \gamma \rightarrow \gamma A'$ is obtained, as a function of the kinetic mixing parameter $\varepsilon$ and dark photon mass $m_{A'}$. Taking the light-by-light scattering as background, the constraints on the dark photon parameter space for different time intervals in a MeV-scale $\gamma$-$\gamma$ collider are also given.