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Generalized Parton Distributions of Light Nuclei

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Abstract

The measurement of nuclear generalized parton distributions (GPDs) in hard exclusive processes, such as deeply virtual Compton Scattering (DVCS), will be one of the main achievements of a new generation of experiments at high luminosity. Let us mention those under way at the Jefferson Laboratory (JLab) with the 12 GeV electron beam and, above all, those planned at the future Electron Ion Collider. The CLAS collaboration at JLab has recently demonstrated the possibility to disentangle the the coherent and incoherent channels of nuclear DVCS, a first step towards the measurement of GPDs of nuclei and of bound nucleons, respectively, opening new exciting perspectives in the field. In this scenario, accurate calculations, ultimately realistic, become mandatory. Light nuclei, for which realistic studies are affordable and conventional nuclear effects can be safely estimated, so that possible exotic effects can be exposed, play an important role. The status of the calculation of GPDs for light nuclei will be summarized, in particular for \(^3\)He and \(^4\)He, and some updates will be presented. The prospects for the next years, related to the new series of measurements at future facilities, will be addressed.

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Acknowledgements

We gratefully acknowledge the collaboration with R. Dupré and M. Viviani, and many crucial discussions with E. Voutier and M. Hattawy on the Jefferson Lab esperiments. S.F. thanks P. Sznajder and C. Mezrag for some tuition on the use of the virtual access infrastructure 3DPARTONS, funded by the European Union’s Horizon 2020 research and innovation programme under grant agreement No 824093. This work was supported in part by the STRONG-2020 project of the European Union’s Horizon 2020 research and innovation programme under grant agreement No 824093, Working Package 23, “GPDS-ACT” and by the project “Deeply Virtual Compton Scattering off \(^4\)He”, in the programme FRB of the University of Perugia.

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  1. Department of Physics and Geology, Perugia University and INFN, Perugia, Via A. Pascoli snc, 06123, Perugia, Italy

    Sara Fucini, Matteo Rinaldi & Sergio Scopetta

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Fucini, S., Rinaldi, M. & Scopetta, S. Generalized Parton Distributions of Light Nuclei. Few-Body Syst 62, 3 (2021). https://doi.org/10.1007/s00601-020-01590-0

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