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Double deeply virtual Compton scattering (DDVCS) is the process where anelectron scatters off a nucleon and produces a lepton pair. The main advantageof this process in contrast with deeply virtual and timelike Comptonscatterings (DVCS and TCS) is the possibility of directly measuring GPDs for$x\neq\pm\xi$ at leading order in $\alpha_s$ (LO). We present a new calculationof the DDVCS amplitude based on spinor techniques which produce expressions foramplitudes that are perfectly suited for their implementation in numericalsimulations. Elements of impact studies, including predictions for experimentsat JLab12, JLab20+ and the Electron-Ion Collider (EIC), are studied by means ofthe PARTONS software and the EpIC Monte Carlo event generator.

Double DVCS as a window to the complete mapping of GPDs