摘要: We report on a precise study of the x and Q(sub 2) dependence of the proton, deuteron and neutron structure functions. In particular R = (sigma)(sub L)/(sigma)(sub T), F(sub 2(sub p)), F(sub 2(sub d)), and the ratio F(sub 2(sub d)... 展开 We report on a precise study of the x and Q(sub 2) dependence of the proton, deuteron and neutron structure functions. In particular R = (sigma)(sub L)/(sigma)(sub T), F(sub 2(sub p)), F(sub 2(sub d)), and the ratio F(sub 2(sub d))/F(sub 2(sub p)) were extracted in a combined analysis of SLAC deep inelastic electron scattering experiments. Data from eight experiments were radiatively corrected with a new improved radiative correction formalism, and all experiments were normalized to the precise data of SLAC E140, thus yielding a single coherent data set. We find that R(sub p) = R(sub d) as expected from QCD. The results for R are somewhat larger than the prediction of QCD with target mass effects, thus indicating the existence of additional dynamic higher twist effects. Using both SLAC and CERN data, we obtained a parametrization of R in the range 0.5< Q(sup 2) <200 GeV/c(sup 2) and 0.1 < x < 0.86. This fit in conjunction with the normalized hydrogen and deuterium cross sections was used to extract precise values of F(sub 2). These data provide a constraint at low Q(sup 2) for high Q(sup 2) muon and neutrino experiments. A study of the Q(sup 2) dependence of the ratio of deuteron and proton structure functions shows a slope which is consistent with QCD and explains the difference in this ratio between SLAC and CERN experiments. 7 figs. (ERA citation 15:033433) 收起