论文标题
Deuteron和全球QCD分析中的核效应
Nuclear effects in the deuteron and global QCD analyses
论文作者
论文摘要
我们报告了一项新的全球QCD分析的结果，其中包括质子和氘的深度无弹性$ e/μ$散射数据，以及质子 - 普罗替子和质子 - 销售碰撞的Drell-Yan Lepton对生产，以及$ w^\ pm/z $ boson的生产数据，来自$ pp $和$ pp $ pp $ \ bar p $ p $ \ bar p $ collisions at lhc and the lhc and the lhc and the lhc and tevat。杜特隆的核效应是根据核卷积方法的处理，该方法在弱结合近似中具有结合的外壳核子。外壳校正由Bjorken变量$ x $的通用函数控制，该$ x $描述了绑定核子中Parton分布的修饰，这在我们的分析中与质子的Parton分布函数一起确定。进行了许多系统的研究，以估算使用各种氘数据集引起的不确定性，这是由于对较高的扭曲贡献对结构功能的建模，通过治疗目标质量校正以及迪特伦的核更正。我们获得了比率$ f_2^n/f_2^p $和$ d/u $的预测，重点是$ x $的区域。我们还将结果与其他QCD分析获得的结果以及马拉松实验的最新数据进行了比较。
We report the results of a new global QCD analysis, which includes deep-inelastic $e/μ$ scattering data off proton and deuterium, as well as Drell-Yan lepton pair production in proton-proton and proton-deuterium collisions and $W^\pm/Z$ boson production data from $pp$ and $p \bar p$ collisions at the LHC and Tevatron. Nuclear effects in the deuteron are treated in terms of a nuclear convolution approach with bound off-shell nucleons within a weak binding approximation. The off-shell correction is controlled by a universal function of the Bjorken variable $x$ describing the modification of parton distributions in bound nucleons, which is determined in our analysis along with the parton distribution functions of the proton. A number of systematic studies are performed to estimate the uncertainties arising from the use of various deuterium datasets, from the modeling of higher twist contributions to the structure functions, from the treatment of target mass corrections, as well as from the nuclear corrections in the deuteron. We obtain predictions for the ratios $F_2^n/F_2^p$, and $d/u$, focusing on the region of large $x$. We also compare our results with the ones obtained by other QCD analyses, as well as with the recent data from the MARATHON experiment.
