Phenomenology of double deeply virtual Compton scattering in the era of new experiments

TL;DR

This paper explores the phenomenology of double deeply virtual Compton scattering (DDVCS), emphasizing its role in reconstructing generalized parton distributions (GPDs) and providing practical computational tools for upcoming experiments.

Contribution

It introduces leading order complex amplitudes for DDVCS and Bethe-Heithler processes using spinor techniques, facilitating their implementation in simulation frameworks.

Findings

Provides leading order amplitudes for DDVCS and Bethe-Heithler processes.

Highlights the importance of DDVCS in GPD reconstruction.

Develops tools compatible with the PARTONS and EpIC frameworks.

Abstract

We revisit the phenomenology of the deep exclusive electroproduction of a lepton pair, i.e. double deeply virtual Compton scattering (DDVCS), in view of new experiments planned in the near future. The importance of DDVCS in the reconstruction of generalized parton distributions (GPDs) in their full kinematic domain is emphasized. Using Kleiss-Stirling spinor techniques, we provide the leading order complex amplitudes for both DDVCS and Bethe-Heithler sub-processes. Such a formulation turns out to be convenient for practical implementation in the PARTONS framework and EpIC Monte Carlo generator that we use in simulation studies.