Abstract
Starting from a relativistic formulation of the pion-nucleon-delta system, the most general structure of 1 M corrections for a heavy baryon chiral lagrangian including spin 3 2 resonances is given. The heavy components of relativistic nucleon and delta fields are integrated out and their contributions to the next-to-leading order lagrangians are constructed explicitly. The effective theory obtained admits a systematic expansion in terms of soft momenta, the pion mass m π and the delta-nucleon mass difference Δ. As an application, we consider neutral pion photoproduction at threshold to third order in this small scale expansion.
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