pi N to Multi-pi N Scattering in the 1/Nc Expansion
Abstract
We extend the 1/Nc meson-baryon scattering formalism to pi N to multi-pi N case. We first show that the leading-order large Nc processes proceed through resonant intermediate states (e.g., rho N or pi Delta). We find that the pole structure of baryon resonances can be uniquely identified by their (non)appearance in eta N or mixed partial-wave pi Delta final states.
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