Generalized transverse momentum dependent parton distributions (GTMDs) are the most general parton correlation functions of hadrons. By considering the exclusive double Drell-Yan process it is shown for the first time how quark GTMDs can be measured. Specific GTMDs can be addressed by means of polarization observables.
@article{arxiv.1702.04387,
title = {Generalized TMDs and the exclusive double Drell-Yan process},
author = {Shohini Bhattacharya and Andreas Metz and Jian Zhou},
journal= {arXiv preprint arXiv:1702.04387},
year = {2020}
}