Photoproduction of an isovector ρπ state at 1775 MeV

Evidence is presented for the charge-exchange photoproduction, in two distinct reactions, of an isovector ρπ state of mass ∼1775 MeV. Results of an analysis of the decay-angular distributions are also presented, from which it is concluded that ${\mathit{J}}^{\mathit{P}}$=$1^{\mathrm{-}}$, $2^{\mathrm{-}}$, or $3^{+}$.