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A search for the decay K S ->π 0 γγ has been made using the NA48 detector at the CERN SPS. Using data collected in 1999 during a 40-hour run with a high-intensity K S beam, an upper limit for the branching ratio BR(K S ->π 0 γγ,z>=0.2)<3.3x10 -7 has been obtained at 90% confidence level, where z=m γγ2 /m K0...
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