Photoproduction reaction γn → K*0Λ in an effective Lagrangian approach

In our previous work [Phys. Rev. C 101, 014003 (2020)], the photoproduction reaction gamma p -> K*(+)Lambda was investigated within an effective Lagrangian approach. The reaction amplitudes were constructed by including the t-channel K, K*, and kappa exchanges, u-channel Lambda, Sigma, and Sigma* exchanges, s-channel N, N(2000)5/2(+), and N(2060)5/2(-) exchanges, and interaction current. The data on the differential cross sections and spin density matrix elements were described simultaneously. In this study, we investigate the photoproduction reaction gamma n -> K*(0)Lambda based on the same reaction mechanism as that of gamma p -> K*(+)Lambda to obtain a unified description of the data for gamma p -> K*(+)Lambda and n -> K*(0)Lambda within the same model. All hadronic coupling constants, form factor cutoffs, and the resonance masses and widths in the present calculations remain the same as in our previous work for gamma p -> K*(+)Lambda. The available differential cross-section data for gamma n -> K*(0)Lambda are well reproduced. Further analysis shows that the cross sections of gamma n -> K*(0)Lambda are dominated by the contributions of the t-channel K exchange, while the s-channel N(2000)5/2(+) and N(2060)5/2(-) exchanges also provide considerable contributions.