Coherent ${\rho }^0$ photoproduction in bulk matter at high energies

Elsa Couderc, Spencer Klein

The momentum transfer $\Delta k$ required for a photon to scatter from a target and emerge as a ${\rho }^0$ decreases as the photon energy $k$ rises. For $k>3\times 10^{14}$ eV, $\Delta k$ is small e…