Chiral Effective Field Theory in the Delta-resonance region

Abstract

I discuss the problem of constructing an effective low-energy theory in the vicinity of a resonance or a bound state. The focus is on the example of the $\Delta (1232)$, the lightest resonance in the nucleon sector. Recent developments of the chiral effective-field theory in the $\Delta$-resonance region are briefly reviewed. I conclude with a comment on the merits of the manifestly covariant formulation of chiral EFT in the baryon sector.

Comments: 12 pages, 7 figs; plenary contribution to Chiral Dynamics 2006