π-核Drell-Yan数据在核部分子分布函数整体分析中的适用性
Applicability of pion-nucleus Drell-Yan data in global analysis of nuclear parton distribution functions
摘要：
尽管现代核部分子分布函数（nPDF）在描述核硬过程数据方面取得了成功，但它们仍然存在很大的不确定性。其中一个约束性差的特征是价态$u$和$d$夸克的核修饰可能存在不对称性。我们研究了使用π-核Drell-Yan双轻子数据作为nPDF全局分析的新约束的可能性。我们发现，从NA 3，NA 10和E615实验的核截面比可以使用，而不施加显着的新的理论不确定性，特别是，这些数据集可能有一些约束力的$u$ / $d$ -不对称性的核。
英文摘要：
Despite the success of modern nuclear parton distribution functions (nPDFs) in describing nuclear hard-process data, they still suffer from large uncertainties. One of the poorly constrained features is the possible asymmetry in nuclear modifications of valence $u$ and $d$ quarks. We study the possibility of using pion-nucleus Drell-Yan dilepton data as a new constraint in the global analysis of nPDFs. We find that the nuclear cross-section ratios from the NA3, NA10 and E615 experiments can be used without imposing significant new theoretical uncertainties and, in particular, that these datasets may have some constraining power on the $u$/$d$ -asymmetry in nuclei.
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