Speaker
Description
We present a phenomenological analysis of hadron-in-jet production in $pp$ collisions within a TMD approach, employing a collinear configuration for the initial state.
We mainly focus on the Collins azimuthal asymmetries for pion-in-jet production, adopting recent extractions of the transversity and the Collins fragmentation functions (FFs) from SIDIS and $e^+e^-$ processes. The general agreement of our estimates with the available data from the STAR Collaboration corroborates the hypothesis of the TMD factorization for such processes as well as of the universality of the Collins FF.
Similar conclusions, towards a general universality of the TMD FFs, can be drawn from a complementary study of the transverse polarization of $\Lambda$ hyperons produced within a jet in unpolarized $pp$ collisions.
Open issues and future improvements, on both the experimental and the theoretical
side, are also discussed.