LAUSR

In the quantum statistical parton distribution approach proposed more than one decade ago to describe the parton structure, new properties are now understood; in particular the relation between quarks and antiquarks leads to very specific properties. The simultaneous treatment of unpolarized and polarized parton distribution functions (PDFs) allows a determination of thermodynamical potentials (the master parameters of the model) which drive their behavior and consequently the behavior of the structure functions. The existence of a possible relation between the gluon and a $q\overline{q}$ pair leads to define a toy model for the unpolarized and polarized gluons. In view of forthcoming experimental results in the large-$x$ region, specific predictions made by the model are presented.