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

Abstract

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}.

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

References in corpus (3)

• The CKM Matrix and the Unitarity Triangle
• Rare Kaon Decays Revisited
• Observation of the rare decay Ks->pi0e+e-

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