Pole versus Breit-Wigner resonance description of the orbitally excited baryons

Abstract

We consider the masses used in recent studies involving the nonstrange sector of the l=1 baryons. The use of T-matrix and K-matrix poles versus the conventional Breit-Wigner masses is discussed within the context of a large-Nc fitting scheme.

Comments: 6 pages of text. No figures. Revised to include further comparisons, as suggested by the referee