A new upper limit for the branching ratio for the decay η → π0e+e−
1975
Abstract We have looked for the decay η → π 0 e + e − in an optical spark chamber experiment at the Rutherford Laboratory. Our observations are consistent with no events being seen and give an upper limit rate ( η → π 0 e + e − )/ rate ( η → all ) −5 (90% C.L.).
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