Measurements of the $Q^2$-Dependence of the Proton and Neutron Spin Structure Functions g1p and g1n

Abstract

The structure functions g1p and g1n have been measured over the range 0.014 < x < 0.9 and 1 < Q2 < 40 GeV2 using deep-inelastic scattering of 48 GeV longitudinally polarized electrons from polarized protons and deuterons. We find that the Q2 dependence of g1p (g1n) at fixed x is very similar to that of the spin-averaged structure function F1p (F1n). From a NLO QCD fit to all available data we find ${\Gamma }_1^p-{\Gamma }_1^n=0.176\pm 0.003\pm 0.007$ at Q2=5 GeV2, in agreement with the Bjorken sum rule prediction of 0.182 \pm 0.005.

17 pages, 3 figures. Submitted to Physics Letters B

References in corpus (1)

• Measurement of the Deuteron Spin Structure Function g_1^d(x) for 1 (GeV/c)^2 < Q^2 < 40 (GeV/c)^2

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