Search for dark photon decays to μ$^{+}$μ$^{−}$ at NA62
(2023) Journal of High Energy Physics — Vol. 09 (2023)
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- Abstract
- The NA62 experiment at CERN, designed to study the ultra-rare decay K$^{+}$ → π$^{+} \nu \overline{\nu} $, has also collected data in beam-dump mode. In this configuration, dark photons may be produced by protons dumped on an absorber and reach a decay volume beginning 80 m downstream. A search for dark photons decaying in flight to μ$^{+}$μ$^{−}$ pairs is reported, based on a sample of 1.4 × 10$^{17}$ protons on dump collected in 2021. No evidence for a dark photon signal is observed. A region of the parameter space is excluded at 90% CL, improving on previous experimental limits for dark photon masses between 215 and 550 MeV/c$^{2}$.
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Citations
Cortina Gil, E., Jerhot, J., Kleimenova, A., Lurkin, N., Zamkovsky, M., NA62, & et al. (2023). Search for dark photon decays to μ$^{+}$μ$^{−}$ at NA62. Journal of High Energy Physics, 09. https://doi.org/10.1007/JHEP09(2023)035 (Original work published 2023)