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

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

2004-09-02

arxiv.org/abs/hep-ex/0409011v1

Phys.Lett.B599:197-211,2004

Physics

High Energy Physics

High Energy Physics - Experiment

19 pages, 8 figures, 4 tables. To be published in Physics Letters B

Scientific paper

10.1016/j.physletb.2004.08.058

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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