The ${\eta }^{\prime }{g}^{\ast }{g}^{(\ast )}$ Vertex Function in Perturbative QCD and ${\eta }^{\prime }$-Meson Mass Effects

A. Ali, A. Ya. Parkhomenko

The ${\eta }^{\prime }{g}^{\ast }{g}^{(\ast )}$ effective vertex function (EVF) is calculated in the QCD hard-scattering approach, taking into account the ${\eta }^{\prime }$-meson mass. We work in the approxim…