标题： R比值和核结构函数的矩 显示英文标题

标题： R-ratios and moments of nuclear structure functions

摘要： 我们研究了一个将核子和核结构函数联系起来的模型。计算得到的Callen-Gross函数$\kappa^A(x,Q^2)= 2xF_1^A(x,Q^2)/F_2^A(x,Q^2)$在有限$Q^2$时接近其渐近值1。利用这些$\kappa$，我们计算了$R$对于$Q^2\ge 5 GeV^2$的比值。我们回顾了从包含散射和ENC数据中提取$R$所使用的近似方法。 进一步我们计算了$F_k$的矩的比值，并发现这些比值能够描述数据，特别是它们的$Q^2$依赖性。 上述可观测量以及包括截面，是对核子和核结构函数之间基本关系的敏感测试。 鉴于总体的一致性，我们推测上述关系有效地避开了QCD计算。 显示英文摘要

摘要： We study implications of a model, which links nuclear and nucleon structure functions. Computed Callen-Gross functions $\kappa^A(x,Q^2)= 2xF_1^A(x,Q^2)/F_2^A(x,Q^2)$ appear for finite $Q^2$ to be close to their asymptotic value 1. Using those $\kappa$, we compure $R$ ratios for $Q^2\ge 5 GeV^2$. We review approximate methods in use for the extraction of $R$ from inclusive scattering and ENC data. Further we calcuate ratios of the moments of $F_k$ and find these to describe the data, in particular their $Q^2$ dependence. The above observables, as well as inclusive cross sections, are sensitive tests for the underlying relation between nucleonic and nuclear structure functions. In view of the overall agreement, we speculate that the above relation effectively circumvents a QCD calculation.