Probing quark orbital angular momentum in electron-proton collisions

In these proceedings, we present our proposal to extract quark orbital angular momentum (OAM) through exclusive production in electron-(longitudinally-polarized) proton collisions. Our analysis demonstrates that the azimuthal angular correlation between the transverse momentum of the scattered electron and the recoil proton is a sensitive probe of quark OAM. We also provide a numerical estimate of the asymmetry associated with this correlation for the kinematics accessible at EIC and EicC, aiming to demonstrate the feasibility of measuring our observable. Our work paves the way for the first measurement of quark OAM in relation to the Jaffe-Manohar spin sum rule.