Learning about the 3D nucleon structure with novel hard exclusive processes

The so-called Generalized Parton Distributions have been introduced more than 30 years ago now, and their interpretation allows for a better understanding of the multidimensionnal "position" versus "momentum" partonic distributions in the nucleon. Yet, very few measurement exist beyond DVCS and light vector mesons in worldwide experiments and data. Recent theory progresses however emphasize the importance of new measurements to constrain GPD models and allow for interpretations.

In this talk, I will discuss why it is fundamental to complement the existing measurements with novel reactions that have not been measured yet, or are poorly studied. I will present a brief summary of the outcome of a dedicated workshop we are hosting in July 2022 about this topic, with theorist and experimental specialists working at different facilities. I will also provide projections and physics interest for some reactions that can be measured in a short time-scale at Jefferson Lab, including (non-DVCS) Compton-like processes and vector mesons.