Non-perturbative structure of the nucleon

Chiral perturbation theory is the effective field theory of the standard model. In this talk, I discuss some applications of this framework to the pion--nucleon system. These are chiral corrections to the S--wave pion--nucleon scattering lengths, the reaction $πN \to ππN$ at threshold and low--energy theorems in $π^0$ photoproduction.

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