The spin-dependent structure function of the proton g(1)(p) and a test of the Bjorken sum rule

Abstract

The inclusive double-spin asymmetry has been measured at COMPASS in deep-inelastic polarised muon scattering off a large polarised NH3 target. The new proton asymmetries were obtained and are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function.

The isovector quark density, Δq3(x,Q2), is evaluated from a NLO QCD The first moment of Δq3 is in good agreement with the value predicted by the Bjorken sum rule.

Keywords

• COMPASS
• Deep inelastic scattering
• Spin
• Structure function
• QCD analysis
• Bjorken sum rule