Features of ω photoproduction off nucleon target at forward angles: dominance of π exchange with Regge cuts and scaling of differential cross-sections

Abstract

We investigate the photoproduction of ω off a nucleon target by using a Reggeized model where π(135) + σ(500) + f1(1285) + f2(1270) + pomeron exchanges are included in the t-channel for the reaction at forward angles. The reaction mechanism at low energy is featured by the dominance of the π exchange with the absorptive cuts introduced to modulate the pion contribution to both γp → ωp and reactions. The necessity of σ exchange is illustrated in the analysis of the cross-section from natural parity exchanges. Cross-sections for the differential, total, and spin density matrix with parity and beam polarization asymmetries are reproduced and compared with existing data on . Scaled differential cross-sections of Jefferson Lab data on are investigated at the production angle θ = 90° with the nonlinear trajectories for a saturation. Differential and total cross-sections for the reaction are analyzed to compare with recent experimental data at the CBELSA/TAPS Collaboration. An application of the reaction is presented to demonstrate the significance of the π exchange in the total and differential cross-sections.