科研之友
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摘要
We discuss the Pade approximation to the pi pi scattering amplitudes in one-loop chiral perturbation theory. The approximation restores unitarity and can reproduce the correct resonance poles, but the approximation violates crossing symmetry and produces spurious poles on the complex s plane and therefore plagues its predictions in some cases. However we End that one virtual state in the IJ = 20 channel may have physical relevance.
- 出版日期2001-11-15
- 单位北京大学
