Speaker
Description
We study photoproduction of light vector mesons, $\rho^0$, $\omega$, and $\phi$ in nuclei by utilizing the Glauber scattering theory for photo-nuclear interactions. Avoiding ad hoc parameterizations of the scattering amplitude and the cross section frequently assumed in the conventional Glauber theory, the subnuclear processes, including vector meson photoproduction $\gamma N \to VN$ and subsequent elastic scattering $VN \to VN$ off nucleons, are described by the Reggeized meson exchange within the framework of the eikonal integral for the nuclear process.
Current theoretical calculations reproduce experimental results to a good degree, revealing that Pomeron exchange becomes dominant over the meson exchange in the energy region above the resonances, namely at $E_\gamma\geq3$ GeV, and that the transverse component of the nuclear cross section gives the contribution much larger than the longitudinal one by a factor of $10^{4}$. The application to the analysis of nuclear transparencies in the electromagnetic production of mesons in nuclei is presented, with the role of the shadowing discussed.
