Nature of nonperturbative effects in lepton-nucleon scattering

There is evidence for substantial nonperturbative effects in the structure functions extracted from deep-inelastic lepton-nucleon scattering. These effects have a major impact on αₛ and Λ determinations. Results which I reported previously for μN and νN scattering (F₂ and xF₃) are extended to include ed data which are at lower W² and higher x and have extremely high statistics. Possible analytical forms for higher-twist terms and for αₛ are considered in detail here using μN, νN, and ed data.