Measurement of the $K^+\toπ^+ν\barν$ Branching Ratio

Details Measurement of the $K^+\toπ^+ν\barν$ Branching Ratio Measurement of the $K^+\toπ^+ν\barν$ Branching Ratio

2007-09-07

arxiv.org/abs/0709.1000v2

Phys.Rev.D77:052003,2008

Physics

High Energy Physics

High Energy Physics - Experiment

99 pages, 32 figures, 12 tables. Added authors, corrected typos and modify the text suggested by the referees. Accepted for pu

Scientific paper

10.1103/PhysRevD.77.052003

Experiment E949 at Brookhaven National Laboratory studied the rare decay \$K^+\to\pi^+\nu\bar{\nu}$ and other processes with an exposure of $1.77\times 10^{12}$ $K^+$'s. The data were analyzed using a blind analysis technique yielding one candidate event with an estimated background of $0.30\pm0.03$ events. Combining this result with the observation of two candidate events by the predecessor experiment E787 gave the branching ratio ${\calB}(K^+\to\pi^+\nu\bar{\nu})=(1.47^{+1.30}_{-0.89})\times 10^{-10}$, consistent with the Standard Model prediction of $(0.74\pm0.20)\times 10^{-10}$. This is a more detailed report of results previously published in Physical Review Letters.

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