Non-perturbative Parton Distributions in the Proton

TL;DR

This paper presents a model for proton parton distributions based on physical arguments, deriving analytical valence distributions, modeling sea quarks from pions, and successfully describing experimental data with DGLAP evolution, including intrinsic charm.

Contribution

It introduces an analytical model for valence and sea parton distributions in the proton, incorporating hadronic fluctuations and intrinsic charm, aligned with experimental data.

Findings

Analytical valence distributions derived from physical principles

Sea quark distributions modeled via pion fluctuations

Proton structure function F_2(x,Q^2) matches DIS data after evolution

Abstract

A model for the parton distributions in hadrons is derived from simple physical arguments leading to an analytical expression for the valence distributions. The sea parton distributions arise mainly from pions in hadronic fluctuations. Evolving from a low Q^2_0 scale with DGLAP gives the proton structure function F_2(x,Q^2) in good agreement with DIS data. An extension of the model to describe intrinsic charm quarks in the proton is discussed.