Test of the Vector-Dominance Model by Forward and Backward ρ^{0} Pion Production

Abstract

The validity of the vector-dominance model has been tested by ${\rho }^0$ pion production at 4 GeV and ${\pi }^{+}$ photoproduction data. In the forward direction, a remarkable agreement has been observed with the photoproduction data, down to $t_{min}$. ${\rho }^0$ pion production in the backward direction shows good agreement through this model with available photoproduction data in the $u$ channel. A comparison is made with theoretical work on $\Delta$-Regge trajectory exchange.