CEA/Irfu staff members are among the principal investigators of ongoing experiments at the Jefferson Lab (JLab) in USA, where a high current electron beam up to 11 GeV in energy collides with fixed targets of several types. The high luminosity available at the JLab allows the study of the properties of the nucleons with high statistical accuracy also via rare processes.
Contrary to the naive expectations, it has been shown that not the valence quarks, but rather the gluons carry the major contribution to the mass and the spin of the nucleons. Therefore, it is crucial to precisely characterize gluons distributions in order to fully understand the strong interactions from which results the protons. In particular, the current knowledge of the GPDs of gluons is rather limited. GPDs are accessible through the study of exclusive processes where all the final state particles are detected, and specifically, gluon GPDs can be accessed via the study of the exclusive electroproduction of the ?-meson. This year, data are being collected with a longitudinally polarized target of protons, providing a unique opportunity to understand the correlation between the spin of the proton and the gluons. The goal of this thesis will be to analyze the data taken with the CLAS12 experiment at the Jefferson Lab to extract target-spin, beam-spin and double-spin asymmetries. The future PhD student will have the opportunity to add a side activity to the data analysis, the choice spanning from detector development to detailed phenomenological studies.