Speaker
Description
We propose a new class of exclusive processes for extracting generalized parton distribution functions (GPDs), which provide a powerful theoretical tool to quantify the spatial distribution of quarks and gluons inside a bound hadron. Using exclusive massive-photon-pair production in meson-meson and meson-baryon collisions as an example, we show that the leading non-perturbative contribution to these processes are universal and can be factorized into pion DAs and hadron GPDs, and this class of processes can be systematically studied in terms of QCD factorization approach. We demonstrate quantitatively that these processes offer an enhanced sensitivity to the momentum fraction $x$ of DAs and GPDs, and they are measurable at various facilities worldwide.
