Refined analysis on the parton distribution functions of the proton

TL;DR

This paper presents a refined analysis of proton parton distribution functions using a two-component model that combines vector meson dominance and QCD effects, fitting DIS data at low Q^2 and small x to improve understanding of proton structure.

Contribution

It introduces a two-component model incorporating vector meson dominance and QCD corrections, providing a more accurate extraction of parton distribution functions from DIS data.

Findings

Second moments of PDFs are extracted and compared with other global fits.

The model effectively accounts for target mass and higher twist effects.

Results align well with lattice QCD determinations.

Abstract

We explore the application of a two-component model of proton structure functions in the analysis of deep-inelastic scattering (DIS) data at low $Q^2$ and small $x$. This model incorporates both vector meson dominance and the correct photo-production limit. The CJ15 parameterization is applied to the QCD component, in order to take into account effects of order $1/Q^2$ effects, such as target mass corrections and higher twist contributions. The parameters of the leading twist parton distribution functions and higher twist coefficient functions are determined by fitting deep inelastic scattering data. The second moments of the parton distribution functions are extracted and compared with other global fits and lattice determinations.