Upper Limit on the eta to gamma gamma gamma Branching Ratio with the KLOE Detector
Abstract
We have searched for the C-violating decay eta to gamma gamma gamma in a sample of ~ 18 million eta mesons produced in phi to eta gamma decays, collected with the KLOE detector at the Frascati phi-factory DAFNE. No signal is observed and we obtain the upper limit BR(eta to gamma gamma gamma) less equal than 1.6x10(-5) at 90 % C.L.
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