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arXiv 1409.2639hep-ph
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K介子衰变到两π介子的研究

Study of Kaon Decay to Two Pions

Zhan-Wei Liu, Manuel E. Carrillo-Serrano, Anthony W. Thomas

摘要:

在NJL模型下研究了K介子到两个π介子的弱衰变。用标准有效弱哈密顿量计算了中间态σ介子的衰变振幅和直接衰变振幅。最后状态相互作用的影响也包括在内。当匹配标度选择为使I=2的衰变振幅接近实验值时,σ介子对I=0总振幅的贡献大于85%。这支持了最近的建议,即σ介子应该在解释该系统中的ΔI= 1/2规则中发挥重要作用。

英文摘要:

The weak decay of the kaon to two pions is studied within the NJL Model. Using the standard effective weak Hamiltonian, both the decay amplitude arising from an intermediate state σ-meson and the direct decay amplitude are calculated. The effect of final state interactions is also included. When the matching scale is chosen such that the decay amplitude with isospin I=2 is close to its experimental value, the σ-meson contributes more than 85% of the total I=0 amplitude. This supports recent suggestions that the σ-meson should play a vital role in explaining the ΔI= 1/2 rule in this system.

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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