Addendum to predicting the $K^0\Lambda$ photoproduction observables by using the multipoles approach

Abstract

Abstract We present an addendum to our previous paper to improve the performance of the proposed isobar model in describing the $\gamma + n\to K^0+\Lambda$ reaction observables. Since two new data sets have become available for this reaction channel that show sizable discrepancies, i.e. the CLAS and MAMI data, we propose three different models, M1, M2, and M3, obtained from including the CLAS, MAMI, and both data sets, respectively, in the fitting database. The new models can nicely describe the $\gamma+p\to K^++\Lambda$ observables, as in the case of the previous model, but significantly improve the agreement with the new $\gamma + n\to K^0+\Lambda$ cross section data. The extracted resonance properties in the present models can be well constrained within the current Particle Data Group estimates. The different contributions of the background and resonance terms in the previous and present calculations are thoroughly discussed. A brief discussion on the problem of data discrepancy is also presented.