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Investigation of $K_{L,S} \rightarrow \pi^{+}\pi^{-}e^{+}e^{-}$ decays / NA48 Collaboration
The $K_{L} \to \pi^{+}\pi^{-}e^{+}e^{-}$ and $K_{S} \to \pi^{+}\pi^{-}e^{+}e^{-}$ decay modes have been studied in detail using the NA48 detector at CERN SPS. Based on the data collected during the 1998 and 1999 run periods, a sample of 1162 $K_{L} \to \pi^{+}\pi^{-}e^{+}e^{-}$ candidates has been observed with an expected background level of 36.9 events, yielding the branching ratio measurement $BR(K_{L} \to \pi^{+}\pi^{-}e^{+}e^{-})=(3.08 \pm 0.20) \times 10^{-7}$. [...]
CERN-EP-2003-006.- Geneva : CERN, 2003 - 33 p. - Published in : Eur. Phys. J. C 30 (2003) 33-49 Fulltext: PDF; - CERN library copies

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