Speaker
Description
The understanding of the three-dimensional internal structure of the proton has significantly been developed over the past few decades. In particular, the extraction of Transverse Momentum Dependent distributions (TMDs) from global fits of experimental data has now reached an impressive level of precision. In this talk, I will present first indications of flavor dependence emerging from the latest simultaneous extraction of unpolarized quark TMD parton distribution functions (PDFs) and fragmentation functions (FFs), based on a global analysis of Drell–Yan and Semi-Inclusive DIS data at next-to-next-to-next-to-leading logarithmic (N3LL) accuracy within the MAP collaboration framework.
I will also discuss the extension of our knowledge of the proton's 3Ds tructure in the case of longitudinal polarization. In particular, I will show recent results on the extraction of the quark helicity TMD PDF, which provide insight into the differences in the three-dimensional motion of quarks with spin parallel or antiparallel to the longitudinal
polarization of the proton.
