The dynamical coupled-channels approach developed at the Excited Baryon Analysis Center is extended to include the $\omega N$ channel to study π- and ω-meson production induced by scattering pions and photons from the proton. Six intermediate channels, including $\pi N$, $\eta N$, $\pi \Delta$, $\sigma N$, $\rho N$, and $\omega N$, are employed to describe unpolarized and polarized data. Bare parameters in an effective hadronic Lagrangian are determined in a fit to the data for $\pi N\to \pi N$, $\gamma N\to \pi N$, ${\pi }^{-}p\to \omega n$, and $\gamma p\to \omega p$ reactions at center-of-mass energies from threshold to $W<2.0$ GeV. The $T$ matrix determined in these fits is used to calculate the photon beam asymmetry for ω-meson production and the $\omega N\to \omega N$ total cross section and $\omega N$-scattering lengths. The calculated beam asymmetry is in good agreement with the observed in the range of energies near threshold to $W\lesssim 2.0$ GeV.

• Received 22 February 2008

DOI:https://doi.org/10.1103/PhysRevC.79.025208