New Measurement of Deep-Inelastice−pAsymmetries

Abstract

Spin-dependent asymmetries have been measured in inclusive deep-inelastic scattering of longitudinally polarized electrons by longitudinally polarized protons. Data were obtained at a scattering angle of 10° and for incident energies of 16.2 and 22.7 GeV, which cover the kinematic range $0.18<x<\mathrm{}0.70\mathrm{}$ and $3.5<\mathrm{}{Q}^2<10.0\mathrm{}$ (${\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. The present results provide a test of scaling and of the Bjorken and Ellis-Jaffe sum rules and are compared with various models of proton spin structure.