Dark photons and displaced vertices at the MUonE experiment
Abstract
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 $10~\mathrm{MeV} \le m_{A'} \le 100~\mathrm{MeV}$ and kinetic mixing parameter $10^{-5} \le \epsilon e \le 10^{-3}$, through the process $\mu^{\pm}\, e^- \to \mu^{\pm}\, e^-\, A'$ followed by $A'\to e^+e^-$.
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Citation (BibTeX)
@article{Galon:2022xcl,
author = {Galon, Iftah and Shih, David and Wang, Isaac R.},
title = {{Dark photons and displaced vertices at the MUonE experiment}},
eprint = {2202.08843},
archiveprefix = {arXiv},
primaryclass = {hep-ph},
doi = {10.1103/PhysRevD.107.095003},
journal = {Phys. Rev. D},
volume = {107},
number = {9},
pages = {095003},
year = {2023},
}