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A search for the rare decays KS→π0e+e− and KS→π0μ+μ− has been made by the NA48/1 experiment at the CERN SPS. The data were collected during 2002 in an 89 day run with a high-luminosity KS beam. Seven KS→π0e+e− candidates have been observed with an expected background of 0.15 events. There were six KS→π0μ+μ− candidates observed with an expected background of 0.22−0.11+0.18 events. The measured branching...
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