Rich and complex dark sectors are abundant in particle physics theories. Here we propose performing spectroscopy of the mass structure of dark sectors via mono-photon searches at lepton colliders. The energy of the mono-photon tracks the invariant mass of the invisible system it recoils against, which enables studying the resonance structure of the dark sector. We demonstrate this idea with several well-motivated models of dark sectors. Such spectroscopy measurements could potentially be performed at Belle II, BES-III and future low-energy lepton colliders.
@article{arxiv.1706.05008,
title = {Dark Spectroscopy},
author = {Yonit Hochberg and Eric Kuflik and Hitoshi Murayama},
journal= {arXiv preprint arXiv:1706.05008},
year = {2018}
}