Deeply-virtual and photoproduction of mesons at higher-order and higher-twist

Abstract

Both deeply-virtual and photoproduction of mesons offer promising access to generalized parton distributions and complementary description of different kinematical regions. The higher-order contributions offer stabilizing effect with respect to the dependence on renormalization scales, while higher-twist effects have been identified as especially important in the case of the production of pseudo-scalar mesons. This was confirmed by recent evaluation of the complete twist-3 contribution to $\pi$ and $\eta$/${\eta }^{\prime }$ photoproduction and its confrontation with experimental data.

Comments: 10 pages, 5 figures; Presented at XXIX Cracow Epiphany Conference on Physics at the Electron-Ion Collider and Future Facilities, Cracow, Poland, 16-19 January 2023, to appear in Acta Physica Polonica B Supplemet