Several hypothetical light New Physics particles have been searched using the clean and large electron-positron collision samples collected by the BaBar collaboration around the Υ(4S) resonance. No evidence has been found and 90% confidence level upper limits have been set on a dark photon decaying into electron or muon pairs, on a next-to-minimal supersymmetric Higgs boson decaying to charmed
hadrons, and to an exotic π0-like particle that would couple to the tau lepton
