近日，伊朗拉齐大学的F. AbdieA&B. Rezaei&G.R. Boroun及其研究团队取得一项新进展。经过不懈努力，他们实现eA过程中核胶子分布的非线性修正。相关研究成果已于2024年3月15日在国际知名学术期刊《中国物理C》上发表。

本文对核胶子分布函数在小x处次领头阶近似下的非线性修正进行了解析研究。研究人员利用参数化F2(x,Q2)和Khanpour-Soleymaninia-Atashbar-Spiesberger-Guzey模型得到的核修饰因子，考虑了核胶子分布函数在x和Q2低值处的非线性修正。

在Q20=1.69GeV²时，基线质子胶子密度采用CT18胶子分布。研究人员深入探讨了胶子密度在初始尺度Q20的次领头阶，和次次领头阶近似下的行为表现，以及由于非线性修正而引起的修饰。

此外，研究人员发现，对于轻核和重核，QCD非线性修正对于次领先阶精度比次次领先阶精度更显著。非线性GLR-MQ演化方程的结果与rausch - guzey - klassen胶子在不确定度内向上和向下演化的结果相似。最后，他们发现胶子分布的大小随x的减小和原子序数A的增大而增大。

附：英文原文

Title: Nonlinear corrections for the nuclear gluon distribution in eA processes

Author: G.R. Boroun, B. Rezaei, F. Abdi

Issue&Volume: 2024-03-15

Abstract: An analytical study with respect to the nonlinear corrections for the nuclear gluon distribution function in the next-to-leading order approximation at small x is presented. We consider the nonlinear corrections to the nuclear gluon distribution functions at low values of x and Q² using the parametrization F₂(x,Q²)and the nuclear modification factors obtained from the Khanpour-Soleymaninia-Atashbar-Spiesberger-Guzey model. The CT18 gluon distribution is used for the baseline proton gluon density at Q²₀=1.69GeV². We discuss the behavior of the gluon densities in the next-to-leading order and the next-to-next-to-leading order approximations at the initial scale Q²₀, as well as the modifications due to the nonlinear corrections. We find that the QCD nonlinear corrections are more significant for the next-to-leading order accuracy than the next-to-next-to-leading order for light and heavy nuclei. The results of the nonlinear GLR-MQ evolution equation are similar to those obtained with the Rausch-Guzey-Klasen gluon upward and downward evolutions within the uncertainties. The magnitude of the gluon distribution with the nonlinear corrections increases with a decrease in x and an increase in atomic number A.

DOI: 10.1088/1674-1137/ad1cdb

Source: http://hepnp.ihep.ac.cn/article/doi/10.1088/1674-1137/ad1cdb