A Re-Evaluation of the nuclear Structure Function Ratios for D, He, Li, C and Ca

Abstract

We present a re-evaluation of the structure function ratios F2(He)/F2(D), F2(C)/F2(D) and F2(Ca)/F2(D) measured in deep inelastic muon-nucleus scattering at an incident muon momentum of 200 GeV. We also present the ratios F2(C)/F2(Li), F2(Ca)/F2(Li) and F2(Ca)/F2(C) measured at 90 GeV. The results are based on data already published by NMC; the main difference in the analysis is a correction for the masses of the deuterium targets and an improvement in the radiative corrections. The kinematic range covered is 0.0035 < x < 0.65, 0.5 < Q^2 <90 GeV^2 for the He/D, C/D and Ca/D data and 0.0085 < x < 0.6, 0.84 < Q^2 < 17 GeV^2 for the Li/C/Ca ones.

Figures (3)

• Figure 1: Structure function ratios as function of $x$, averaged over $Q^2$. The full circles represent the re-evaluated ratios, the open circles the old ratios. Only statistical errors are shown.
• Figure 2: The re-evaluated NMC structure function ratios for He/D, C/D, Ca/D together with the reanalysed SLAC results. The error bars show the statistical and systematic errors added in quadrature. The normalisation uncertainties are not included.
• Figure 3: The slopes $b$ from a linear fit in $\ln Q^2$ for each $x$ bin separately. The errors shown are statistical only.