Primakoff production of $\pi^0$, $\eta$ and $\eta'$ in the Coulomb field of a nucleus

Understand

Photoproduction of neutral pseudoscalar mesons $\pi^0,\eta(547)$ and $\eta'(958)$ in the Coulomb field of an atomic nucleus is studied using a model which describes the Primakoff and nuclear parts of the production amplitude.

• At high energies the nuclear background is dominated by the exchange of $C$-parity odd Regge trajectories.
• In the coherent production the isospin filtering makes the $\omega(782)$ a dominant trajectory.
• The calculations are in agreement with $\pi^0$ data from JLAB provided the photon shadowing and final state interactions of mesons are taken into account.