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We investigate photoproduction of $\omega$ off a nucleon target $\gammaN\to\omega N$ by using a Reggeized model where$\pi(135)+\sigma(500)+f_1(1285)+f_2(1270)$+Pomeron exchanges are included inthe $t$-channel for the reaction at forward angles. The reaction mechanism atlow energy is featured by the dominance of the $\pi$ exchange with theabsorptive cuts introduced to modulate the pion contribution to both $\gammap\to \omega p$ and $\gamma n\to \omega n$ reactions. Necessity of $\sigma$exchange is illustrated in the analysis of the cross section from naturalparity exchanges. Cross sections for differential, total, and spin densitymatrix with beam polarization are reproduced and compared with existing data on$\gamma p\to \omega p$. Scaled differential cross sections of Jefferson Labdata on $\gamma p\to \omega p$ are investigated at the production angle$\theta=90^\circ$ with the nonlinear trajectories for a saturation.Differential and total cross sections for the $\gamma n\to\omega n$ reactionare analyzed to compare with recent experimental data at the CBELSA/TAPSCollaboration. An application to the $\gamma p\to\omega\Delta^+$ reaction ispresented to demonstrate the significance of the $\pi$ exchange in the totaland differential cross sections.

journal of physics. g, nuclear and particle physics

Features of $\omega$ photoproduction off nucleon target at forward  angles : Dominance of $\pi$ exchange with Regge cuts and scaling of  differential cross sections