Coherent $\phi$ and $\omega$ meson photoproduction from deuteron and nondiffractive channels

For coherent photoproduction of $\phi$ and $\omega$ mesons from deuteron at forward angles, the isovector $\pi$-exchange amplitude is strongly suppressed. We show a possibility to study the nondiffractive channels associated with the unnatural parity exchange in $\phi$ photoproduction and with the baryon resonance excitations in $\omega$ photoproduction by measuring the spin observables.