Article

# Measurement of the $K_{L} \to e^{+}e^{-}e^{+} e^{-}$ Decay Rate

DOI:http://cdsweb.cern.ch/record/828068/files/phep-2005-005.ps.gz
Source: OAI

ABSTRACT The decay rate of the long-lived neutral 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 1998 and 1999, a total of 200 events has been observed with negligible background. This observation corresponds to a branching ratio of Br(K_L -> e^+ e^- e^+ e^-) = (3.30 + - 0.24_stat + - 0.23_sys + - 0.10_norm) x 10^-8.

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### Keywords

decay rate

long-lived neutral K meson

NA48 detector

negligible background