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Dark photons and displaced vertices at the MUonE experiment

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PHYSICAL REVIEW D
卷 107, 期 9, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.107.095003

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MUonE is an experiment designed to measure the hadronic vacuum polarization contribution to muon g - 2 through elastic mu - e scattering. It also has the potential to search for displaced vertices from light, weakly interacting new particles. By demonstrating its sensitivity to dark photons in a specific mass range and kinetic mixing parameter, it shows great promise in this regard.
MUonE is a proposed experiment designed to measure the hadronic vacuum polarization contribution to muon g - 2 through elastic mu - e scattering. As such, it employs an extremely high-resolution tracking apparatus. We point out that this makes MUonE also a very promising experiment to search for displaced vertices from light, weakly interacting new particles. We demonstrate its potential by showing how it has excellent sensitivity to dark photons in the mass range 10 MeV <= m(A)' <= 100 MeV and kinetic mixing parameter 10(-5) <= ee <= 10(-3), through the process mu(+/-)e(-) -> mu(+/-)e(-)A' followed by A' -> e(+)e(-).

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