Dark sector searches at Belle II

Abstract

Belle II has unique reach for a broad class of models that postulate the existence of dark matter particles with MeV-GeV masses. In this manuscript we present recent world-leading physics results from Belle II searches for Z' bosons, axion-like particles, and dark scalars in association with two muons in e⁺e^- collisions; invisible particles produced in decays of tau leptons; long-lived (pseudo)scalars produced in decays of B-mesons; inelastic dark matter; as well as the near-term prospects for other dark sector searches.