The Bethe-Salpeter equation and the Low Energy Theorems for \(\pi N\) scattering
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The Bethe-Salpeter (BS) amplitude for \(\pi N\) scattering is evaluated at the off-mass-shell points corresponding to the Low Energy Theorems (LET) based on PCAC and current algebra. The results suggest a way of maintaining constructing between BS equation and LET.
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- 1.J. Gasser, H. Leutwyler, Ann. Phys. (N.Y.) 158, 142 (1984)Google Scholar