A formalism for the study of $K^{+}\pi \Sigma$ photoproduction in the ${\Lambda }^{\ast }(1405)$ region

Abstract

We present a formalism for the low-energy analysis of the $\gamma p\to K^{+}\pi \Sigma$ photoproduction reaction in the ${\Lambda }^{\ast }(1405)$ resonance region. In particular, the constraints arising from unitarity, gauge invariance and chiral perturbation theory are discussed in some detail.

Comments: Fixed some typos for v2