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A measurement of the $K^{+} \to \pi^{+} \mu^{+} \mu^{-}$ decay
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abstract
A sample of $2.8 \times 10^4$ $K^{+} \to \pi^{+} \mu^{+} \mu^{-}$ 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 $(9.15 \pm 0.08)\times 10^{-8}$, 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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Cited by 1 Pith paper
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Split-even approach to the rare kaon decay $K \to \pi \ell^+ \ell^-$
Applying the split-even estimator to the rare kaon decay lattice calculation reduces statistical noise by roughly an order of magnitude on the dominant loop diagrams.
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