Measurements ofKLbranching fractions and theCPviolation parameter|η+−|

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Abstract

We present new measurements of the six largest branching fractions of the ${K}_{L}$ using data collected in 1997 by the KTeV experiment (E832) at Fermilab. The results are $B({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\mathrm{e}}^{\ensuremath{\mp}}\ensuremath{\nu})=0.4067\ifmmode\pm\else\textpm\fi{}0.0011$, $B({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}}\ensuremath{\nu})=0.2701\ifmmode\pm\else\textpm\fi{}0.0009$, $B({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0})=0.1252\ifmmode\pm\else\textpm\fi{}0.0007$, $B({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0})=0.1945\ifmmode\pm\else\textpm\fi{}0.0018$, $B({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})=(1.975\ifmmode\pm\else\textpm\fi{}0.012)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, and $B({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0})=(0.865\ifmmode\pm\else\textpm\fi{}0.010)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, where statistical and systematic errors have been summed in quadrature. We also determine the $CP$ violation parameter $|{\ensuremath{\eta}}_{+\ensuremath{-}}|$ to be $(2.228\ifmmode\pm\else\textpm\fi{}0.010)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$. Several of these results are not in good agreement with averages of previous measurements.

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