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- W1966302543 abstract "We have measured the ratio R=Γ(KL→γγ)/Γ(KL→π0π0π0) using the KLOE detector. From a sample of ∼109 φ-mesons produced at DAΦNE, the Frascati φ-factory, we select ∼1.6×108 KL-mesons tagged by observing KS→π+π− following the reaction e+e−→φ→KLKS. From this sample we select 27,375 KL→γγ events and obtain R=(2.79±0.02stat±0.02syst)×10−3. Using the world average value for BR(KL→π0π0π0), we obtain BR(KL→γγ)=(5.89±0.07±0.08)×10−4 where the second error is due to the uncertainty on the π0π0π0 branching fraction." @default.
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