Measurement of theK+→π+νν¯branching ratio
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Abstract
Experiment E949 at Brookhaven National Laboratory studied the rare decay ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ and other processes with an exposure of $1.77\ifmmode\times\else\texttimes\fi{}{10}^{12}$ ${K}^{+}$'s. The data were analyzed using a blind analysis technique yielding one candidate event with an estimated background of $0.30\ifmmode\pm\else\textpm\fi{}0.03$ events. Combining this result with the observation of two candidate events by the predecessor experiment E787 gave the branching ratio $\mathcal{B}({K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}})=({1.47}_{\ensuremath{-}0.89}^{+1.30})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$, consistent with the standard model prediction of $(0.74\ifmmode\pm\else\textpm\fi{}0.20)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$. This is a more detailed report of results previously published [V. V. Anisimovsky et al., Phys. Rev. Lett. 93, 031801 (2004)].
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