论文标题
在XFITTER框架中实施目标质量校正和更高扭转的效果
Implementation of target mass corrections and higher-twist effects in the xFitter framework
论文作者
论文摘要
大量动量分数$ x $的Parton分布函数（PDF）的知识不仅对于研究核子中夸克的风味和自旋动力学不仅重要，而且对于在对撞机实验中寻找新物理学的信号。众所周知，非扰动QCD效应通常在此类运动区域起更重要的作用。在这项工作中，我们提出了PDF的开源QCD分析，考虑到目标质量校正（TMCS）和高扭转（HT）效应，当分析还包括来自深度弹性散射（DIS）的数据点时，这些效应是$ x $且较小的Photon Virtuality $ Q^2 $的数据点。为此，我们使用Xfitter软件包作为研究PDF的全面而有力的工具。我们以用户友好的方式报告并讨论有关在XFITTER框架中实现TMC和HT效果的最新活动，以便用户可以打开或关闭它们，并在不同的选项之间进行选择。我们通过考虑TMC和HT效应的PDF的样本分析以及使用广泛的DIS数据来检查修改的有效性。
Knowledge of parton distribution functions (PDFs) at large momentum fraction $ x $ is not only important to study the flavor and spin dynamics of quarks in the nucleon, but also to search for signals of new physics at collider experiments. It is well known now that the nonperturbative QCD effects generally play a more significant role at such kinematic regions. In this work, we present an open-source QCD analysis of PDFs considering target mass corrections (TMCs) and higher-twist (HT) effects which are necessary when the analysis includes also data points from deep inelastic scattering (DIS) with larger values of $ x $ and smaller values of photon virtuality $ Q^2 $. To this aim, we use the xFitter package, as a comprehensive and powerful tool for studying PDFs. We report and discuss our recent activities on the implementation of TMCs and HT effects in the xFitter framework in a user-friendly way, so that the user can switch on or off them, and also choose between different options. We check the validity of the modifications by performing sample analyses of PDFs considering TMCs and HT effects and using a wide range of DIS data.
