标题： 径向激发的异常A依赖性的衍射轻子产生$ρ'(2S)$ 显示英文标题

标题： Anomalous A-dependence of diffractive leptoproduction of radial excitation $ρ'(2S)$

摘要： 我们预测准弹性轻子产生 $A$ 和 $Q^{2}$ 对核的 $\rho^{0}(1S)$ 介子及其径向激发态 $\rho '(2S)$ 的依赖关系显著不同。 对于 $\rho^{0}$ 生产核透明度 $T_{A}$随着 $A$的增加而单调减小，而对于 $\rho'$ 核透明度 $T_{A}$可能具有反直觉的非单调 $A$依赖性，在轻核中具有最小值，并随着 $A$的增加而在中等和重核中增加。 强增强的$\rho ' /\rho^{0}$截面比使核靶成为$\rho '$-工厂。 异常的$A$-依赖性的来源在于颜色透明效应与$\rho '$波函数节点结构的相互作用。 预测的效果发生在中等$Q^{2}\lsim (2-3)$GeV$^{2}$，这可以在CEBAF的高统计量实验中进行探索。 显示英文摘要

摘要： We predict a strikingly different $A$ and $Q^{2}$ dependence of quasielastic leptoproduction of the $\rho^{0}(1S)$-meson and its radial excitation $\rho '(2S)$ on nuclei. Whereas for the $\rho^{0}$ production nuclear transparency $T_{A}$ decreases monotonically with $A$, for the $\rho'$ nuclear transparency $T_{A}$ can have the counterintuitive nonmonotonic $A$-dependence, having the minimum for light nuclei, and increasing with $A$ for medium and heavy nuclei. Strong enhancement of the $\rho ' /\rho^{0}$ cross section ratio makes nuclear targets the $\rho '$-factory. The origin of the anomalous $A$-dependence is in the interplay of color transparency effects with the nodal structure of the $\rho '$ wave function. The predicted effects take place at moderate $Q^{2}\lsim (2-3)$GeV$^{2}$, which can be explored in high statistics experiments at CEBAF.