  We investigate constraints on the properties of light dark matter which can
be obtained from analysis of invisible quarkonium decays at high intensity
electron-positron colliders in the framework of a low energy effective field
theory. A matrix element analysis of all contact operators pertinent for these
meson decays allows for a model-independent calculation of associated dark
matter-nucleon scattering and dark matter annihilation cross sections. Assuming
dark matter couples universally to all quark flavors, we then obtain bounds on
nucleon scattering which complement direct dark matter detection searches. In
contrast to similar analyses of monojet searches at high energy colliders, B
and charm factories are more suitable probes of light dark matter interactions
with less massive mediators. Relevant bounds on dark matter annihilation
arising from gamma ray searches of dwarf spheroidal galaxies are also
presented.
