Seminar: "Status of a statistical approach to the parton distributions"

The aim of the research presented is to give a precise formulation to the statement by Feynman and other scientists that, as a consequence of Pauli principle, in the proton sea 𝑑̅(x) is bigger than 𝑢̅(x), as confirmed by the defect in the Gottfried sum rule and by the study of Drell-Yan pairs in pp and pd scattering. Pauli principle implies the role of quantum statistical mechanics and suggests that parton distributions as a function of x are Fermi-Dirac for the fermions and Bose-Einstein for the gluons at the Q20, which separates the non-perturbative and the perturbative regimes of the evolution. One obtains a description of the non-polarized and polarized distributions and of the spin asymmetries of the sea in terms of few parameters.

Speaker: Prof. Franco Buccella - INFN - Naples