Speaker
Description
The production of light hadrons within jets in polarized $pp$ and $ep$ collisions represents a promising tool to probe transverse momentum dependent (TMD) effects. As for the TMD factorizable processes (Drell-Yan, semi-inclusive DIS and $e^+ e^-$ annihilation into hadron pairs), such a reaction shares common features with them, the presence of two ordered energy scales: a large one, the transverse momentum of the jet, and a small one, the intrinsic transverse momentum of the light hadron with respect to the jet direction. In this regard, this process represents an interesting proxy to study TMD factorization and the universality of TMD distributions.
In this talk, we present recent and ongoing phenomenological analyses on the Collins azimuthal asymmetries in $p^\uparrow p \to {\rm jet}\,\pi\, X $ and $e p^\uparrow \to {\rm jet} \pi X $ collisions within the TMD approach. By adopting recent extractions of the transversity and the Collins fragmentation function from semi-inclusive DIS and $e^+ e^- \to h_1 h_2 X$ processes, we present a comparison with recent STAR data for pp collisions, and predictions for the future Electron-Ion Collider for lepton-proton collisions in the quasi-real photon regime.
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