Mono-γ production of a dark vector at future e + e − colliders* *Supported by the Innovation Capability Support Program of Shaanxi Province (2021KJXX-47), the Double First Class start-up fund (WF220442604), the Shanghai Pujiang Program (20PJ1407800), National Natural Science Foundation of China (12090064), as well as Chinese Academy of Sciences Center for Excellence in Particle Physics (CCEPP)

Abstract

The associated production of a dark particle and photon, represented as a mono-γ event, is a promising channel to probe particle content and dynamics in the dark sector. In this study, we investigate the properties of the mono-γ production of vector dark matter at future colliders. Photon-like and Pauli operators as well as triple gauge boson interactions involving dark matter are considered in the framework of effective field theory. We show that, in comparison with the Pauli operator, the triple gauge boson couplings are significantly more interesting in high energy colliders. Beam polarization effects are also analyzed, and we show that the experimental sensitivities cannot be significantly enhanced because of the smaller luminosity.