如何定义不稳定粒子的物理性质
How to define physical properties of unstable particles
摘要：
在有效量子场论的框架内，我们讨论表征不稳定粒子的物理量的定义。借助于单圈计算，我们从自旋1/2共振的电荷和磁矩的角度研究了这个问题。通过利用场重定义下物理观测量的不变性，我们证明了不稳定粒子的物理性质应该从相应S-矩阵的复（双）极残基中提取.
英文摘要：
In the framework of effective quantum field theory we address the definition of physical quantities characterizing unstable particles. With the aid of a one-loop calculation, we study this issue in terms of the charge and the magnetic moment of a spin-1/2 resonance. By appealing to the invariance of physical observables under field redefinitions we demonstrate that physical properties of unstable particles should be extracted from the residues at complex (double) poles of the corresponding S-matrix.
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