Parton distributions in a constituent quark scenario

TL;DR

This paper models the nucleon's parton distributions using a composite constituent quark approach, successfully matching experimental data for both unpolarized and polarized cases, highlighting the importance of quark substructure.

Contribution

It introduces a convolution model of constituent quarks as composite systems, providing improved agreement with experimental data over non-composite models.

Findings

Good agreement with experimental data for unpolarized distributions.

Accurate predictions for polarized distributions.

Composite quark structure is essential for low-energy nucleon descriptions.

Abstract

A simple picture of the constituent quark as a composite system of point-like partons is used to construct the unpolarized and polarized parton distributions by a convolution between constituent quark momentum distributions and constituent quark structure functions. We achieve good agreement with experiments in the unpolarized, as well as, in the polarized case. When our results are compared with similar calculations using non-composite constituent quarks, the accord with the experiments of the present scheme is impressive. We conclude that DIS data are consistent with a low energy scenario dominated by composite constituents of the nucleon.