%0 Journal Article
%T On the Limits of Chiral Perturbation Theory
%A Thomas Appelquist
%A John Terning
%J Physics
%D 1992
%I arXiv
%R 10.1103/PhysRevD.47.3075
%X We consider the relation between the breakdown scale of chiral perturbation theory, $\Lambda_\chi$, for large values of $N$ (flavor), and the scale associated with ``new" physical thresholds. This question is addressed using both the linear $\sigma$ model and an asymptotically-free gauge theory to describe the high energy dynamics. It is suggested that the massive physical threshold could be well above $\Lambda_\chi$.
%U http://arxiv.org/abs/hep-ph/9211223v2