Testing a Linear Relation: Short-Range Correlations and the EMC Effect for Gluons and Quarks in Nuclei

TL;DR

This paper investigates potential linear correlations between short-range correlations and the EMC effect for gluons and quarks in nuclei, using experimental data and global analyses to explore nuclear modifications of parton distributions.

Contribution

It provides the first systematic test of linear relations between SRCs and the EMC effect for both gluons and quarks, highlighting their potential linear correlations.

Findings

Good linear correlation between gluon distributions and DIS slope.

Strong sensitivity of quark correlations to parameterization models.

Supports nuclear effects in gluon distributions within nuclei.

Abstract

In this work, we focus on the possible linear relation between short-range correlations (SRCs) and the EMC effect for partons in nuclei. First, we test a linear relationship pertaining to gluons in bound nuclei; it is manifested as a correlation between the slope of the reduced cross section ratio in deep inelastic scattering (DIS) and the cross section of sub-threshold $J/\psi$ photoproduction. For comparison, the results from four different global analyses groups of nuclear parton distribution functions (nPDFs) are utilized. These results show a good linear correlation between the gluons in bound nuclei and the slope of the reduced cross section ratio, consistent with the possible presence of nuclear effects in the gluon distributions. Second, we investigate the linear relationship of quarks in the proton-induced Drell-Yan process. The corresponding results for quarks show strong sensitivity to the parameterization forms adopted by the different groups. These findings enhance our understanding of the substructure in bound nuclei and provide valuable reference for future global fitting of nPDFs.