Quantum-chromodynamic analysis ofeNdeep-inelastic scattering data

In the context of quantum chromodynamics (QCD), an analysis is presented of a compilation of $\mathrm{eN}$ deepinelastic scattering data taken at SLAC. Included are data for $F_2^{\mathrm{ep}}$, $F_2^{\mathrm{ed}}$, $F_2^{\mathrm{ep}}-F_2^{\mathrm{en}}$, and $R$. The interaction between the logarithmic scaling violation from ${\alpha }_s$ and the power-law scaling violation from higher-twist terms is discussed. This interaction can affect the determination of the parameter $\Lambda$ and can alter the predictions for the ratios of anomalous dimensions. Furthermore, we show that, in the context of QCD, higher-twist terms may be able to account for the observed value of $R=\frac{{\sigma }_L}{{\sigma }_T}$ which appears to be anomalously large. Different experiments have made different assumptions for the value of $R$ used in extracting $F_2$ from their data. We show that these differences can account for the discrepancies in the relative normalizations of $F_2$ from these experiments and also can have a significant effect on the value of $\Lambda$ obtained.