Further results from charge-exchange photoproduction

It is shown that the energy dependence of charge-exchange $a_2^{+}$ photoproduction ($\gamma p\to n{a}_2^{+}$) agrees with a one-pion exchange mechanism. No evidence for the photoproduction of the $a_1^{+}\mathrm{}\left(1260\right)\mathrm{}$ is observed. If the dynamics of $a_1$ and $a_2$ photoproduction are assumed to be the same, the absence of evidence for the $a_1$ is shown to be consistent with either an extremely large $a_1$ hadronic width or with an $a_1$ of mass somewhat less than 1260 MeV.