Measurement of prominent Ε-decay branching fractions
作者： D. Riley , A. Ryd , A. J. Sadoff , X. Shi , S. Stroiney
DOI: 10.1103/PHYSREVLETT.99.122001
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摘要: The decay {psi}(2S){yields}{eta}J/{psi} is used to measure, for the first time, all prominent {eta}-meson branching fractions with same experiment in dataset, thereby providing a consistent treatment of systematics across fractions. We present results {eta} decays {gamma}{gamma}, {pi}{sup +}{pi}{sup -}{pi}{sup 0}, 3{pi}{sup -}{gamma} and e{sup +}e{sup -}{gamma}, accounting 99.9% decays. precision several their ratios improved. Two channels, show that differ at level three standard deviations from those previously determined.
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