2023/05/15 by Petersen, Brian
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Instrumentation and Detectors (physics.ins-det)
paper · doi:10.48550/arxiv.2305.08665
FASER is a new LHC experiment designed to search for light, weakly-interacting particles that are produced in proton-proton collisions at the ATLAS interaction point and travel in the far-forward direction. The first physics results from the initial year of data-taking are presented. A search for dark photons decaying to an electron-positron pair found no events, yielding new constraints on dark photons with couplings ε∼ 10-5 - 10-4 and masses ∼ 10 MeV - 100 MeV. A search for muon-neutrino charged-current interactions in a tungsten target at the front of the FASER experiment found 153+12-13 neutrino candidates with a negligible background. The reconstructed charge and momentum distributions imply the observation of both neutrinos and anti-neutrinos with an incident neutrino energy above 200 GeV.