Photoproduction of K*Σ in an effective Lagrangian approach

All the available data on differential cross sections, total cross sections, spin density matrix elements, and parity spin asymmetry for the gamma p -> K*(+)Sigma(0) and gamma p -> K*(0)Sigma(+) reactions are analyzed within an effective Lagrangian approach. The reaction amplitudes are constructed by considering the s-channel exchanges of N, Delta, and their excited states, the t-channel exchanges of K, K*, and kappa, the u-channel exchanges of Lambda, Sigma, and Sigma*, and the interaction current. Two fits with different reaction mechanisms are obtained that describe the data equally well. The s-channel Delta(1905)5/2(+) resonance exchange is found to provide dominant contributions in both fits. The t-channel kappa exchange only contributes significantly to gamma p -> K*(0)Sigma(+) in model II, which challenges the claim made in literature that the available parity spin asymmetry data supports the dominant contribution of kappa exchange in gamma p -> K*(0)Sigma(+).