New Measurement of the $K^{+} \to π^{+} ν \bar{ν}$ Branching Ratio

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7 November 2008

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 101 (19) , 191802
https://doi.org/10.1103/physrevlett.101.191802

Abstract

Three events for the decay

K^{+} \to π^{+} ν \bar{ν}

have been observed in the pion momentum region below the

K^{+} \to π^{+} π^{0}

peak,

140 < P_{π} < 199 MeV / c

, with an estimated background of

0.93 \pm 0.17 (stat .)_{- 0.24}^{+ 0.32} (syst .)

events. Combining this observation with previously reported results yields a branching ratio of

B (K^{+} \to π^{+} ν \bar{ν}) = ({1.73}_{- 1.05}^{+ 1.15}) \times 10^{- 10}

consistent with the standard model prediction.

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