Observation of the rare decay K_S -> pi^0mu^+mu^-

et al. (NA48/1 Collaboration); J. R. Batley

Observation of the rare decay K_S -> pi^0mu^+mu^-

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arxiv hep-ex/0409011 v1 pith:WILV7C2F submitted 2004-09-02 hep-ex

J. R. Batley , et al. (NA48/1 Collaboration) This is my paper · ORCID

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A search for the decay K_S -> pi^0mu^+mu^- has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high-intensity K_S beam. Six events were found with a background expectation of 0.22^+0.18_-0.11 event. Using a vector matrix element and unit form factor, the measured branching ratio is B(K_S -> pi^0mu^+mu^-)=[2.9^+1.5_-1.2(stat)+/-0.2(syst)]x10^{-9}.

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Split-even approach to the rare kaon decay $K \to \pi \ell^+ \ell^-$
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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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