Coherent $\phi$-meson photoproduction on deuteron

Coherent $\phi$-meson photoproduction on deuteron is studied in a high-statistics photo-deuteron experiment at CLAS with a tagged photon beam ($E_{\gamma}=$ 0.8 -- 3.6~GeV). The reaction $\gamma d \rightarrow \phi d$ is identified in the $K\bar{K}d$ final state. Because of the iso-scalar target, exchange of iso-vector mesons (e.g. $\pi$ exchange) are not allowed. A comparison of cross sections with proton results would reveal the iso-spin structure of the production amplitudes. The high luminosity and a wide acceptance of CLAS enable one to measure the coherent $\phi$ photoproduction reaction at large angles for the first time. At large angles, the $\phi$-nucleon cross section ($\sigma_{\phi N}$) can be investigated via a double scattering diagram. Recently, LEPS measured $\sigma_{\phi N}$ from nuclear A-dependence. The $\sigma_{\phi N}$ is large compared to the quark model prediction. A comparison of $\sigma_{\phi N}$ with the one from the A-dependence is of great interest in connection with poss