Bethe-Schwinger有效射程理论与Lehmann和Weinberg手征微扰理论
Bethe-Schwinger Effective Range Theory and Lehmann and Weinberg Chiral Perturbation Theories
摘要：
本文从40年代后期Bethe和Schwinger关于核子-核子散射的低能有效射程理论的提出，到π介子散射的Chew-Low模型的推广，再到Lehmann和Weinberg手征微扰理论的发展，对低能软强子物理作了简要的评述。指出在手征微扰理论中引入么正性关系，可以得到一致的低能计算。
英文摘要：
This paper is a brief review of low energy soft hadronic physics, starting from the invention of the low energy effective range theory in the late 40's due to Bethe and Schwinger for nucleon-nucleon scattering, and its generalization to the static Chew-Low model for pion nucleon scattering, to the present development of the Lehmann and Weinberg Chiral Perturbation Theories. It is pointed out that a consistent low energy calculation can be achieved with the incorporation of the unitarity relation in the Chiral Perturbation Theory.
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