Photoproduction of ${\psi }^{\prime }$ as a Test of Color-Octet Model

T. Morii, D. Roy, K. Sudoh

We have calculated the cross section of ${\psi }^{\prime }$ photoproduction at small-$p_T$ regions in polarized $\gamma p$ collisions for testing the color-octet model, which is based on NRQCD factor…