Double Counting Ambiguities in the Linear Sigma Model

Abstract

We study the dynamical consequences imposed on effective chiral field theories such as the quark-level SU(2) linear $\sigma$ model (L$\sigma$M) due to the fundamental constraints of massless Goldstone pions, the normalization of the pion decay constant and form factor, and the pion charge radius. We discuss quark-level double counting L$\sigma$M ambiguities in the context of the Salam-Weinberg $Z=0$ compositeness condition. Then SU(3) extensions to the kaon are briefly considered.

Comments: 23 pages To be published in Journal of Physics G