Long lived particles and dark photons at LHCb

The LHCb detector at the LHC is designed for indirect searches for physicsbeyond the Standard Model by the precise study of heavy hadron decays, but ithas a great potential also in direct searches of new light states below theelectroweak scale. Its excellent sensitivity has been recently demonstrated witha set of searches for light dimuon resonances (such as dark photons) and fordisplaced vertices due to particles with a significantly long lifetime.