Speaker
Description
We developed a new spectral function approach for calculation of parton distribution in hadrons for the valence quark region. The approach explicitly introduces the light-front wave function of the residual state allowing to construct the light-front spectral function of the hadron in which case valence quarks are massless embedded in the mean field of the residual state.
Within this approach we calculated parton distributions of nucleons and demonstrated that even for starting Q0 the x-weighted valence quark distributions peak at 1/4 indicating the existence of residual structure resembling a meson cloud. Calculation of the pion PDFs shows no such a residual structure and reproduces the recent empirical extraction of the pion PDF reasonably well without leaving much room for hard mechanism of the generation of PDFs at large x. We discuss also how our approach can be extended for calculation of Generalized Parton and Transverse Momentum distributions in hadrons.
