Some New Features in the Pseudoscalar Meson and Vector Meson Photoproductions

We investigate the role of the t -channel meson exchange in various photoproduction processes to discuss features of the respective production mechanism. For the less model-dependent analysis we work with the t -channel meson pole reggeized in the Born approximation amplitude. With the meson–baryon coupling constants chosen consistently with symmetry prediction we show that the Reggeized pole model could reproduce the experimental data to a good degree in the lower energy region. Numerical consequences show the significance of the tensor meson exchange in the γ p → K + Λ, the dominance of the pseudoscalar meson exchange in the π Δ (and K Σ*) processes, and the sizable role of the vector-meson magnetic moment in the charged ρ (and K *) photoproductions, respectively. These new features from the present analyses could provide a useful guide for future study of the N * resonances in the low energy region.