The FASER experiment at the LHC is designed to search for light, weakly-interacting particles produced in proton proton collisions at the ATLAS interaction point that travel in the far-forward direction. The first results from luminosity of 27.0 fb-1collected at centre-of-mass energy root a search for dark photons decaying to an electron-positron pair, using a dataset corresponding to an integrated = 13.6 TeV in 2022 in LHC Run 3, are presented. No events are seen in an almost background-free analysis, yielding world-leading constraints on dark photons with couplings - 2 x 10-5 - 1 x 10-4 and masses 17 MeV - 70 MeV. The analysis is also used to probe the parameter space of a massive gauge boson from a U(1)- model, with couplings - 5 x 10-6 - 2 x 10-5 and masses 15 MeV - 40 MeV excluded for the first time.
