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Precise measurement of the decay $K_{L} \to \pi^{0}\gamma\gamma$
The decay rate of $K_{L} \to \pi^{0}\gamma\gamma$ has been measured with the NA48 detector at the CERN SPS. A total of 2558 $K_{L} \to \pi^{0}\gamma\gamma$ candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be $(1.36 \pm 0.03_{(stat)} \pm 0.03_{(sy...
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