Crossing-consistent analysis of kaon photoproduction and radiative capture

A crossing-consistent description is presented for $K^{+}$ photoproduction $p(\gamma ,K^{+})\Lambda$ and $K^{-}$ radiative capture $p(K^{-},\gamma )\Lambda$ using an effective-chiral-Lagrangian model. Crossing requires that these reactions should both be described by the same physical model including identical dynamic parameters such as coupling constants. It is demonstrated that previous analyses of these crossing-related reactions, which have also used this effective-chiral-Lagrangian model, have not utilized the crossing constraint and thus do not simultaneously describe both kaon photoproduction and capture. New sets of coupling constants that consistently describe both reactions are presented.