Speaker
Description
The quark-gluon dynamics manifests itself in a set of non-perturbative functions describing all possible spin-spin and spin-orbit correlations. Recent studies of correlated hadron pairs, including the pairs created in target and current fragmentation region, indicate significant correlations in hadron fragmentation process. Their understanding is becoming increasingly important in the interpretation of pion electroproduction data in general, and hadronization process of quarks, in particular. More significant, than originally anticipated, fraction of pions coming from correlated di-hadrons, indicated by recent measurements at JLab, and supported by various realistic models describing the hadronization process, may have a significant impact on various aspects of data analysis, including the modeling, composition, and interpretation of semi-inclusive DIS data, as well as calculations of radiative corrections. Detailed studies in multi-dimensional space, of various multiplicities and different azimuthal modulations in single and di-hadron case as a function of transverse momentum of involved hadrons and the $Q^2$, will be needed to sort out all disagreements with theory predictions and improve the phenomenology of 3D PDFs.
In this contribution, we will present ongoing studies and some proposed future measurements with hadrons in electroproduction at large $Q^2$, with current CLAS12 detector at Jefferson Lab, and discuss opportunities with JLab energy upgrade to 24 GeV.
