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±0.24stat±0.23syst±0.10norm)×10−8.
Measurement of the K_L --> e+ e- e+ e- decay rate
CONTALBRIGO, Marco;DALPIAZ, Pietro;GIANOLI, Alberto;MARTINI, Mara;PETRUCCI, Ferruccio Carlo;SAVRIE', Mauro;
2005
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±0.24stat±0.23syst±0.10norm)×10−8.File in questo prodotto:
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