A measurement of the $K^{+} \to \pi^{+} \mu^{+} \mu^{-}$ decay
(2022) Journal of High Energy Physics — Vol. 11 (2022)
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- et. al.
- Abstract
- A sample of 2.8 × 10$^{4}$K$^{+}$ → π$^{+}$μ$^{+}$μ$^{−}$ candidates with negligible background was collected by the NA62 experiment at the CERN SPS in 2017–2018. The model-independent branching fraction is measured to be (9.15 ± 0.08) × 10$^{−8}$, a factor three more precise than previous measurements. The decay form factor is presented as a function of the squared dimuon mass. A measurement of the form factor parameters and their uncertainties is performed using a description based on Chiral Perturbation Theory at $ \mathcal{O} $(p$^{6}$).
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Citations
Cortina Gil, E., NA62, Lurkin, N., & et al. (2022). A measurement of the $K^{+} \to \pi^{+} \mu^{+} \mu^{-}$ decay. Journal of High Energy Physics, 11. https://doi.org/10.1007/JHEP11(2022)011 (Original work published 2022)