Detecting interactions between dark matter and photons at high energy $e^+e^-$ colliders

TL;DR

This paper explores how future high-energy electron-positron colliders can detect dark matter-photon interactions through specific channels, potentially shedding light on gamma-ray signals observed by Fermi-LAT.

Contribution

It introduces a method to test dark matter-photon interactions at colliders using effective operators and derives unitarity conditions for related processes.

Findings

Operators can be tested with polarized and unpolarized beams.

Unitarity bounds are established for dark matter production processes.

Potential to interpret gamma-ray line signals from Fermi-LAT.

Abstract

We investigate the sensitivity to the effective operators describing interactions between dark matter particles and photons at future high energy $e^+e^-$ colliders via the $\gamma+ \slashed{E}$ channel. Such operators could be useful to interpret the potential gamma-ray line signature observed by the Fermi-LAT. We find that these operators can be further tested at $e^+ e^-$ colliders by using either unpolarized or polarized beams. We also derive a general unitarity condition for $2 \to n$ processes and apply it to the dark matter production process $e^+e^-\to\chi\chi\gamma$.