Nucleon and Δ resonances in γp →k+ ς0 (1385) photoproduction

The photoproduction of γp→K+ς0(1385) is investigated based on an effective Lagrangian approach using the tree-level Born approximation, with the purpose of understanding the reaction mechanisms and resonance contents and their associated parameters in this reaction. In addition to the t-channel K and K∗(892) exchanges, s-channel nucleon (N) exchange, u-channel Λ exchange, and generalized contact term, the exchanges of a minimum number of N and Δ resonances in the s channel are taken into account in constructing the reaction amplitudes to describe the experimental data. It is found that the most recent differential cross-section data from the CLAS Collaboration can be well reproduced by including one of the N(1895)1/2-, Δ(1900)1/2-, and Δ(1930)5/2- resonances. The reaction mechanisms of γp→K+ς0(1385) are discussed in detail, and the predictions of the beam and target asymmetries for this reaction are given. The cross sections of γp→K0ς+(1385) are shown to be able to further constrain the theoretical models and pin down the resonance contents for γp→K+ς0(1385).