Reggeized model for $\gamma p\to {\rho }^{-}{\Delta }^{++}(1232)$ photoproduction

Abstract

A model for the reaction $\gamma p\to {\rho }^{-}{\Delta }^{++}$ is presented with the $t$-channel $\pi +\rho$ exchanges reggeized to describe the reaction up to high energies. Gauge invariance of $\rho$ exchange is discussed in connection with the convergence of the reaction cross section at high energy. The roles of electromagnetic (EM) multipole moments of ${\Delta }^{++}$ baryon and of ${\rho }^{-}$ meson are analyzed in total and differential cross sections and spin density matrix elements. Photon polarization asymmetry $\Sigma$ is predicted for a measurement of electromagnetic moments of ${\rho }^{-}$ and of ${\Delta }^{++}$.

Comments: 8 pages, 7 figures, 1 table