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Search for Dark Photons with the FASER detector at the LHC
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 a search for dark photons decaying to an electron-positron pair, using a dataset corresponding to an integrated luminosity of collected at center-of-mass energy 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 and masses . The analysis is also used to probe the parameter space of a massive gauge boson from a U(1) model, with couplings and masses excluded for the first time.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 a search for dark photons decaying to an electron-positron pair, using a dataset corresponding to an integrated luminosity of 27.0 fb collected at center-of-mass energy 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 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 and masses 15 MeV - 40 MeV excluded for the first time