We present a Lorentz-invariant formulation of baryon chiral perturbation theory including spin-3/2 fields. Particular attention is paid to the projection on the spin-3/2 components of the delta fields. We also discuss the nucleon mass and the pion–nucleon sigma term.
No takes yet. Share an insight, caveat, or question.
Bernard et al. (2003) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: