核深非弹性散射在 $x=0.3$ 附近
Nuclear Deep Inelastic Scattering around $x=0.3$
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中文总结 AI 辅助
该研究通过全局分析 $x=0.3$ 附近核DIS截面比数据,发现核效应在价夸克峰值区域显著抵消,并在微观模型中解释该现象。
中文摘要 AI 辅助
从氘到铅的原子核上的深非弹性散射(DIS)数据表明,在 $x=0.3$ 附近(价夸克分布达到峰值处),核效应对束缚核子部分子结构的影响非常小。我们给出了在 $0.25 \leq x \leq 0.35$ 范围内 DIS 截面比 $\sigma^A/\sigma^{{}^2\text{H}}$ 的全局分析结果,揭示了在所有核靶范围内核效应的显著抵消。我们还讨论了在结构函数核修正的微观模型框架下对这一观测结果的解释。
英文摘要
Deep-inelastic scattering (DIS) data on nuclei, from deuterium to lead, indicate that nuclear effects on the partonic structure of bound nucleons are remarkably small around $x=0.3$, where valence-quark distributions peak. We present the results of a global analysis of DIS data on the cross-section ratios $σ^A/σ^{{}^2\text{H}}$ in the range $0.25 \leq x \leq 0.35$, revealing a remarkable cancellation of nuclear effects across the entire range of nuclear targets. We also discuss the interpretation of such an observation within a microscopic model of nuclear modifications of the structure functions.