Many-Body Correlation Effects on the <i>x</i><sub>Bjorken</sub>-Dependence of Cross Section Ratios off Nuclei for 1 <<i>x</i><sub>Bjorken</sub><2

作     者：Athanasios Petridis Allen Barr Drew Fustin Athanasios Petridis;Allen Barr;Drew Fustin

作者机构：Department of Physics and Astronomy Drake University Des Moines USA 

出 版 物：《Journal of Modern Physics》 (现代物理（英文）)

年 卷 期：2022年第13卷第1期

页      面：56-65页

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

主　　题：Deep Inelastic Scattering Quasi-Elastic Scattering Short-Range Correlations Quark-Clusters 

摘      要：Many-body correlations in nuclei determine the behavior of Deep-Inelastic-Scattering (DIS) and Quasi-Elastic Scattering (QES) cross section ratios off heavy over light nuclei especially for xBjorken 1, obtained at Jefferson Lab. They can be described in terms of quark-cluster formation in nuclei due to wave-function overlapping, manifesting itself when the momentum transfer is high so that the partonic degrees of freedom are resolved. In clusters (correlated nucleons) the quark and gluon momentum distributions are softer than in single nucleons and extend to xBjorken 1. The cluster formation probabilities are computed using a network-defining algorithm in which the initial nucleon density is either standard Woods-Saxon or is input from lower energy data while the critical radius for nucleon merging is an adjustable parameter. The exact choice of critical radius depends on the specific nucleus and it is anti-correlated to the rescaling of the xBjorken needed for bound nucleons. The calculations show that there is a strong dependence of the cross section ratios on the xBjorken in agreement with the data and that four-body correlations are needed to explain the experimental results even in the range 1 xBjorken 2. The dependence on the specific exponents of parton distributions in high-order clusters is weak.