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arXiv 1707.04026hep-phhep-ex
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两介子散射和产生振幅的一般非猝灭性质

General unquenching properties of two-meson scattering and production amplitudes

Eef van Beveren, George Rupp

摘要:

除了对多共振散射振幅的么正性和对称性要求外,其他几个自然条件可以很容易地排除不切实际的建议。特别是,奇异性的行为下的模型参数的变化产生重要的信息。讨论了当耦合常数和质量变化时,共振极点如何在复能平面内移动,阈值以上的共振如何转变为阈值以下的束缚态,以及轻夸克谱如何转变为重夸克谱,并给出了相同的散射振幅解析表达式.此外,它表明,扰动近似通常不满足这些自然条件。

英文摘要:

Besides the unitarity and symmetry requirements for a multi-resonance scattering amplitude, several other natural conditions can easily exclude unrealistic proposals. In particular, the behaviour of singularities under the variation of model parameters yields important information. We discuss how resonance poles should move in the complex-energy plane when coupling constants and masses are varied, how resonances above threshold can turn into bound states below threshold and how the light-quark spectrum can be turned into the spectrum of heavy quarks, with one and the same analytic expression for the scattering amplitude. Moreover, it is shown that perturbative approximations usually do not satisfy those natural conditions.

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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