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Measurement of the $K_{L} \to e^{+}e^{-}e^{+} e^{-}$ decay rate
The decay rate of the neutral long-lived $K$ meson into the $e^{+}e^{-}e^{+}e^{-}$ final state has been measured with the NA48 detector at the CERN SPS. Using data collected in 1999, a total of 132 events has been observed with negligible background. The total number of kaons was determined to be $5...
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