The Non-perturbative Effect on $R={\sigma }_L/{\sigma }_T$ from QCD Vacuum

Abstract

We investigate the non-perturbative effects on the ratio $R={\sigma }_L/{\sigma }_T$ in lepton-nucleon deep inelastic scattering by taking into account the lowest dimensional condensate contributions from the QCD vacuum. By combining conventional perturbative QCD corrections and the Georgi- Politzer target-mass effects with the non-perturbative effects from the QCD vacuum, we give a good description of the $Q^2$ and $x$ dependences of $R$ in comparison with the recent experimental data.

13 pages, LaTeX, 2 eps figures, To appear in Phys. Lett. B