πN在第二层上的散射振幅
Scattering Amplitude of πN on the Second Sheet
摘要：
为了从πN散射的弹性区数据中提取极点参数，我们提出了散射振幅（f_{1+} ^{3}（s））的参数化方法.这是通过直接考虑分波振幅的解析性质并明确地写出振幅的色散关系来实现的。
英文摘要：
We propose parameterization procedures of the scattering amplitude f_{1+}^{3}(s)) with a view to extracting the pole parameters from data in the elastic region of πN scattering. This is achieved by considering the analyticity properties of partial wave amplitudes directly and writing dispersion relations for the amplitude explicitly.
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