Measurement of the Branching Fraction of the Decay K L →π + π ? e + e ?
Journal
Physical Review Letters
Journal Volume
80
Journal Issue
19
Pages
4123-4126
Date Issued
1998
Author(s)
Adams, J. et al. (KTeV Collaboration)
Abstract
We report the first branching fraction measurement of the decay KL→π+π−e+e−.With a sample of 46 candidates, and an expected background level of 9.4 events, the branching fraction is determined to be B(KL→π+π−e+e−) = [3.2±0.6(stat)±0.4(syst)]×10−7.This measurement was carried out as part of the Fermilab KTeV (E799-II) experiment and is in good agreement with the expectations from the mechanisms of direct emission and inner bremsstrahlung. © 1998 The American Physical Society.
Type
journal article