The authors derive general formulas separating the pole and nonpole parts of the meson-baryon T-matrix and show the pole part is automatically unitary due to dressing.
(B5), M µ x (x = u, t) denotes the x-channel (tree-level Feynman diagram) contribution and, ˜mµ s stands for the s-channel bare current
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Complex phase structure of the meson-baryon $T$-matrix
The authors derive general formulas separating the pole and nonpole parts of the meson-baryon T-matrix and show the pole part is automatically unitary due to dressing.