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Elastic πN scattering and the reaction π+p → K+∑+ are described simultaneously in a unitary coupled-channels approach which respects analyticity. SU(3) flavor symmetry is used to relate the t- and u-channel exchanges that drive the meson-baryon interaction in the different channels. Angular distributions, polarizations, and spin-rotation parameters are compared with available experimental data. The pole structure of the amplitudes is extracted from the analytic continuation.

The reactionπ+p→K+∑+in a unitary coupled-channels model

The reactionπ⁺p→K⁺∑⁺in a unitary coupled-channels model