Measurements of the $Q^2$ dependence of the proton and neutron spin structure functions $g^p_1$ and $g^n_1$

Abstract : he 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.
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Submitted on : Monday, November 25, 2002 - 4:09:44 PM
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• HAL Id : in2p3-00011615, version 1

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P.L. Anthony, R.G. Arnold, T. Averett, H.R. Band, M.C. Berisso, et al.. Measurements of the $Q^2$ dependence of the proton and neutron spin structure functions $g^p_1$ and $g^n_1$. Physics Letters B, Elsevier, 2000, 493, pp.19-28. ⟨in2p3-00011615⟩

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