Gravity helps show strong force strength in the proton
(a) QCD factorization of the DVCS amplitude. The perturbatively calculable “hard part” is shown to lowest order in the strong coupling. The nonperturbative “soft part” is described by the universal quark GPDs. (b) One of the QED diagrams for the amplitude of the Bethe-Heitler process, which has the same final state as DVCS and interferes
Randy Redner
January 24, 2024