Coherentπ0photoproduction in the isobar-hole formalism

The isobar-hole formalism for pion-nucleus interactions is applied to coherent ${\pi }^0$ photoproduction on nuclei. The unifying features of this approach for elastic scattering and photoproduction are discussed, and the relationship to distorted-wave impulse approximation calculations and the phenomenological doorway model are examined. The results are presented for ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$($\gamma$,${\pi }^0$)${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ and show a large suppression from the impulse approximation prediction.