Journal or Book Title
PHYSICS LETTERS B
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 nucleons and delta fields are integrated out and their contributions to the next-to-leaing order lagrangians are constructed explicitly. The effective theory obtained admits a systematic expansion in terms of soft momenta, the pion mass $m_\pi$ and the delta-nucleon mass difference $\Delta$. As an application, we consider neutral pion photoproduction at threshold to third order in this small scale expansion.
Hemmert, TR; Holstein, BR; and Kambor, J, "Systematic 1/M expansion for spin 3/2 particles in baryon chiral perturbation theory" (1997). PHYSICS LETTERS B. 344.
Retrieved from https://scholarworks.umass.edu/physics_faculty_pubs/344