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arXiv 0912.3440hep-phhep-exnucl-ex
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介子衰变中的尖点效应

Cusp effects in meson decays

Bastian Kubis

摘要:

π质量差在K+ --> pi 0 pi 0 pi+衰变的pi 0 pi 0不变质量分布中产生一个明显的尖点。正如Cabibbo最初指出的那样,尖点的精确测量可以让人们以高精度确定S波π介子-π介子散射长度。我们提出了非相对论性的有效场论框架,允许以一种简单的方式来确定这个尖点的结构,包括辐射校正的影响。同样的形式主义的其他衰变通道,特别是埃塔和埃塔'衰变的应用程序,也进行了讨论。

英文摘要:

The pion mass difference generates a pronounced cusp in the pi0 pi0 invariant mass distribution of K+ --> pi0 pi0 pi+ decays. As originally pointed out by Cabibbo, an accurate measurement of the cusp may allow one to pin down the S-wave pion-pion scattering lengths to high precision. We present the non-relativistic effective field theory framework that permits to determine the structure of this cusp in a straightforward manner, including the effects of radiative corrections. Applications of the same formalism to other decay channels, in particular eta and eta' decays, are also discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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