Search for dark photons with the FASER detector at the LHC
QC1-999
FOS: Physical sciences
7. Clean energy
530
High Energy Physics - Experiment
High Energy Physics - Experiment (hep-ex)
massive
High Energy Physics - Phenomenology (hep-ph)
primary
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Dark matter
TeV
vertex
FASER
electron positron
gauge boson
Physics
scattering
photon
Dark photon
ATLAS
U(1)
Long-lived particles
High Energy Physics - Phenomenology
p p
CERN LHC Coll
B-L
DOI:
10.1016/j.physletb.2023.138378
Publication Date:
2023-12-07T17:58:16Z
AUTHORS (88)
ABSTRACT
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$^{-1}$ collected at center-of-mass energy $\sqrt{s} = 13.6$ 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 $ε\sim 2 \times 10^{-5} - 1 \times 10^{-4}$ and masses $\sim$ 17 MeV - 70 MeV. The analysis is also used to probe the parameter space of a massive gauge boson from a U(1)$_{B-L}$ model, with couplings $g_{B-L} \sim 5 \times 10^{-6} - 2 \times 10^{-5}$ and masses $\sim$ 15 MeV - 40 MeV excluded for the first time.<br/>19 pages, 7 figures<br/>
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