arXiv 2101.112482021-01-27hep-ph

nPDFs核效应引起的Drell-Yan核修正和初态部分子能量损失

The Drell-Yan nuclear modification due to the nuclear effects of nPDFs and initial-state parton energy loss

Li-Hua Song, Peng-Qi Wang, Yin-Jie Zhang

备注：: It is to be published in Chinese Physics C
DOI：: 10.1088/1674-1137/abe110

摘要：

通过对核Drell-Yan数据的全局分析，研究了nPDF的核效应和初态部分子的能量损失。在Landau-Pomeranchuk-Migdal（LPM）体系下，采用Baier-Dokshitzer-Mueller-Peign $\acute{e}$ -Schiff（BDMPS）理论导出的猝灭权重解析参数化方法，利用新的EPPS 16 nPDF进行计算.计算结果与实验数据吻合较好，能量损失效应对Drell-Yan比的抑制作用是显著的，特别是对于低质量的Drell-Yan比测量.随着核质量数A的增大，nPDF的核效应更加明显，能量损失效应也是如此。通过全局拟合，得到的输运系数为$\hat{q}=0.26\pm0.04$ GeV $^{2}$ /fm。另外，为了避免减少对Drell-Yan比数据形式的QCD非线性光学修正，对120 GeV的康普顿微分截面比$R_{Fe(W)/C}(x_{F})$进行了单独计算，为更好地区分康普顿散射中胶子的能量损失提供了一种可行的方法.结果表明，初态胶子能量损失对康普顿散射比的抑制作用不是很大，且随着$x_{F}$的增加而消失.

英文摘要：

By globally analyzing nuclear Drell-Yan data including all incident energies, the nuclear effects of nPDFs and initial-state parton energy loss are investigated. Based on Landau-Pomeranchuk-Migdal (LPM) regime, the calculations are carried out by means of the analytic parametrizations of quenching weights derived from the Baier-Dokshitzer-Mueller-Peign$\acute{e}$-Schiff (BDMPS) formalism and using the new EPPS16 nPDFs. It is found that the results are in good agreement with the data and the role of the energy loss effect on the suppression of Drell-Yan ratios is prominent, especially for low-mass Drell-Yan measurements. The nuclear effects of nPDFs becomes more obvious with the nuclear mass number A, the same as the energy loss effect. By global fit, the transport coefficient extracted is $\hat{q}=0.26\pm0.04$ GeV$^{2}$/fm. In addition, to avoid diminishing the QCD NLO correction on the data form of Drell-Yan ratios, the separate calculations about the Compton differential cross section ratios $R_{Fe(W)/C}(x_{F})$ at 120GeV are performed, which provides a feasible way to better distinguish the gluon energy loss in Compton scattering. It is found that the role of the initial-state gluon energy loss on the suppression of Compton scattering rations is not very important and becomes disappear with the increase of $x_{F}$.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

相关论文