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Abstract: Experiment E949 at Brookhaven National Laboratory studied the rare decay\$K^+\to\pi^+ u\bar{ u}$ and other processes with an exposure of $1.77\times10^{12}$ $K^+$-s. The data were analyzed using a blind analysis techniqueyielding one candidate event with an estimated background of $0.30\pm0.03$events. Combining this result with the observation of two candidate events bythe predecessor experiment E787 gave the branching ratio${\calB}K^+\to\pi^+ u\bar{ u}=1.47^{+1.30} {-0.89}\times 10^{-10}$,consistent with the Standard Model prediction of $0.74\pm0.20\times10^{-10}$. This is a more detailed report of results previously published inPhysical Review Letters.



Autor: The E949 Collaboration

Fuente: https://arxiv.org/







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