Extended formalism for the study of final-state interaction in $γ p\,→\,K⁺π\,Σ$ photoproduction

We extend the formalism for the low-energy analysis of the γ p→ K⁺πΣ photoproduction reaction to include the strangeness $S=-1$ meson-baryon p-wave final-state interaction with total angular momentum J=3/2\,. As an application, and a check of our method, we evaluate contributions due to the exchange of the Σ^(1385) resonance as derived from a chiral Lagrangian.