Observation of the rare decay KS -> pi0mu+mu-
Abstract
A search for the decay KS -> pi0mu+mu- has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high-intensity KS 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(KS -> pi0mu+mu-)=[2.9+1.5-1.2(stat)+/-0.2(syst)]x10-9.
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