Improved Measurement of the K+→π+νν¯ Branching Ratio
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ID: 269870
2004
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Abstract
An additional event near the upper kinematic limit for ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ has been observed by experiment E949 at Brookhaven National Laboratory. Combining previously reported and new data, the branching ratio is $\mathcal{B}({K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}})=({1.47}_{\ensuremath{-}0.89}^{+1.30})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$ based on three events observed in the pion momentum region $211<P<229\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/c$. At the measured central value of the branching ratio, the additional event had a signal-to-background ratio of 0.9.
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2004physicalimproved
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| Journal | physical review letters |
| Year | 2004 |
| DOI |
doi:10.1103/PhysRevLett.93.031801
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