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arXiv 1101.0621nucl-th
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介子-核子散射动力学模型与分波振幅参数化的比较

Comparing partial-wave amplitude parametrization with dynamical models of meson-nucleon scattering

Mark W. Paris, Ron L. Workman

摘要:

建立和研究了分波振幅参数化方法,特别是Chew-Mandeltek方法和动力学耦合通道模型之间的关系。一个裸极对应于三角洲(1232)共振,发现在最近的动力学模型适合π介子和ω介子的生产反应,比较密切,发现在一个单一的多通道分波振幅参数化SAID。裸极的模型依赖性排除了方法之间的直接联系,但暗示动力学描述和唯象参数化密切相关。

英文摘要:

Relationships between partial-wave amplitude parametrizations, in particular the Chew-Mandelstam approach, and dynamical coupled-channel models are established and investigated. A bare pole corresponding to the Delta(1232) resonance, found in a recent dynamical-model fit to pion- and omega-meson production reactions, compares closely to one found in a unitary multichannel partial-wave amplitude parametrization of SAID. The model dependence of the bare pole precludes a direct connection between the approaches but is suggestive that the dynamical description and the phenomenological parametrization are closely related.

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