## Precise extractions of the x and Q sup 2 dependence of R =. sigma. sub L /. sigma. sub T , F sub 2p , F sub 2d , and F sub 2n / sub 2p from a combined analysis of SLAC (Stanford Linear Accelerator Center) deep inelastic electron scattering experiments

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.more »