论文标题
价值分布可能的通用限制
Possible Universal Limit for Valence Parton Distributions
论文作者
论文摘要
我们报告了一旦党的自由度与强烈相互作用的结合系统（如核子，梅森或几个核子系统在很短的距离）等高能散射相关的，应该观察到价值parton分布可能存在的普遍极限。我们的观察结果是基于以下概念：Bjorken X加权价Parton分布函数具有峰值$ x_p $，其特征是系统中价值夸克（Valence Quarks）进行的平均动量分数。在Valence Quark分布的残留均值场模型中，我们发现$ x_p $具有上限：$ x_p \ leq {1 \ over 2（n_v-1）} $，其中$ n_v $是可以在数个数键入的环境中嵌入的群集中考虑的瓦伦斯夸克数量。这种限制的存在对选择PDF的起始分辨率量表$ q_0 $构成了新的约束。我们对细胞核的预测是，$ x_p \ mid_ {q \ to q_0} \ le {1 \ over 4} $，这与所有可用的价值PDF一致，这些价值PDF采用了选择启动$ q_0 $的标准方法。我们还展示了如何使用该极限的存在来检查核中短范围核子相关性的夸克簇的发作。
We report the observation of the existence of a possible universal limit for valence parton distributions that should exist once partonic degrees of freedom are relevant for high energy scattering from strongly interacting bound systems like a nucleon, meson or a few nucleon system at very short distances. Our observation is based on the notion that the Bjorken x weighted valence parton distribution function has a peak, $x_p$, that characterizes the average momentum fraction carried out by the valence quarks in the system. Within the residual mean-field model of the valence quark distribution we found that $x_p$ has an upper limit: $x_p \leq {1\over 2(n_V-1)}$, where $n_V$ is the number of valence quarks which can be considered in the cluster embedded in the strongly interacting environment of the bound system. The existence of such a limit imposes a new constraint on choosing the starting resolution scale $Q_0$ for PDFs. Our prediction for the nucleon is that $x_p\mid_{Q\to Q_0}\le{1\over 4}$, which is in agreement with all the available valence PDFs that employ the standard approach for selecting starting $Q_0$. We also demonstrate how the existence of this limit can be used to check the onset of quark-clusters in short range nucleon correlations in nuclei.
