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Physical Review Letters – 28 January 2002
Volume 88, Issue 4

Plot showing the only two known examples of the K +π + νν̄; the new data point (white dot inside the box) confirms an earlier identification (red triangle). The blue dots are from a simulation of expected events, while data points outside the box are due to background 2-pion decays. The data for this decay, the focus of many decades of effort, yield a branching ratio that agrees within error bars with the standard-model prediction. [S. Adler et al. (E787 Collaboration), Phys. Rev. Lett. 88, 041803 (2002)]

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