In addition to being excellent laboratories for flavor physics, e+e- B factories provide unique probes for GeV-scale particles that arise from new-physics scenarios. Among these, long-lived particles, whose decay creates a visible displaced vertex in the tracking system, are particularly interesting, since their experimental signature provides a means for efficient background suppression.

In this talk I will describe published and proposed searches for such long-lived particles in three different new-physics scenarios: a recently published search for a heavy neutral lepton performed with Belle data (arXiv:2402.02580), a proposed search for the heavy QCD axion (2108.10331), and on-going work on a proposal to search for supersymmetry with a light neutralino and R-parity violation.