In this talk we present the latest results about the extraction of unpolarized Transverse-Momentum-Dependent (TMD) distributions. We discuss the extraction of unpolarized quark TMD Parton Distribution Functions (TMD PDFs) in the proton, as well as TMD Fragmentation Functions (TMD FFs), from global fits of Drell-Yan and Semi-Inclusive Deep-Inelastic Scattering (SIDIS) data sets made by the MAP...
We present an extraction of unpolarized transverse momentum dependent parton distributions functions and Collins-Soper kernel from the fit of Drell-Yan and weak-vector boson production data at the N4LL order of perturbative accuracy. Based on this, Pion TMDPDFs as well as TMD fragmentation functions can be extracted, of which preliminary results are available.
In this talk, we present preliminary results about the path to a global Bayesian reweighting of TMD functions. Within an effective model as the Generalized Parton Model, and by adopting the Sivers, transversity and Collins functions as extracted from SIDIS and $e^+ e^-$ azimuthal asymmetries, we plan a simultaneous reweighting of these TMDs using data on Single-Spin Asymmetries measured at...
The quark-gluon dynamics manifests itself in a set of non-perturbative functions describing all possible spin-spin and spin-orbit correlations defining azimuthal modulations in hard scattering processes. Production of correlated hadron pairs in current, as well as target fragmentation regions, plays an increasingly important role in the interpretation of pion electroproduction data in...
Pion TMDs are not as well defined as their proton counterparts, due to the small amount of available pion scattering data. The recent measurements of unpolarized Drell Yan cross section taken at COMPASS with different targets, could improve the current understanding of pion structures. In the near future also AMBER, a new fixed-target experiment at CERN SPS, will help understand the meson...
