Photoproduction γp→K∗+ Λ in a Reggeized model

The high-precision differential cross-section data for the reaction γp→K∗+Λ are reanalyzed within a Regge-inspired effective Lagrangian approach. The model adopts Regge phenomenology to constrain the t-channel contributions from the κ, K, and K∗ exchanges. A minimal number of resonances in the s channel are introduced in constructing the reaction amplitudes in order to describe the data. It is shown that the differential cross-section data for γp→K∗+Λ can be satisfactorily described by introducing the only N(2060)5/2- resonance in the s channel, which is quite different from our earlier work performed in an effective Lagrangian approach [A. C. Wang et al., Phys. Rev. C 96, 035206 (2017)PRVCAN0556-281310.1103/PhysRevC.96.035206], where the amplitudes are computed by evaluating Feynman diagrams and it is found that introducing at least one additional resonance apart from the N(2060)5/2- is indispensable for reproducing the data. The roles of individual contributions from meson and baryon exchanges on the angular distributions are found to be highly model dependent. The extracted mass of N(2060)5/2- turns out to be well determined, independent of how the t-channel amplitudes are constructed, whereas the width does not.