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- W1964446959 abstract "A crossing-symmetric generalization of the $K$-matrix formalism is developed and used to construct a model for $ensuremath{pi}ensuremath{-}ensuremath{pi}$ scattering. The full amplitude satisfies elastic unitarity in the $s$ channel and has the correct singularity structure at the elastic thresholds in the $t$ and $u$ channels. The two parameters present in the model are determined by requiring approximate satisfaction of the crossing relations in the neighborhood of the symmetry point. The resulting $p$-wave phase shift exhibits a resonance with mass about 800 MeV and width about 250 MeV. The ${f}^{0}$ is not reproduced. The $s$-wave scattering lengths in the $I=0$ and $I=2$ channels are $({a}_{0},{a}_{2})=(ensuremath{-}0.67,ensuremath{-}0.30)$ and the effective Chew-Mandelstam coupling constant is found to be 0.18." @default.
- W1964446959 created "2016-06-24" @default.
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- W1964446959 date "1967-04-25" @default.
- W1964446959 modified "2023-09-25" @default.
- W1964446959 title "Pion-Pion Scattering in aK-Matrix Model Incorporating Crossing Symmetry" @default.
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- W1964446959 doi "https://doi.org/10.1103/physrev.156.1707" @default.
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