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Next-to-leading order QCD analysis of polarized deep inelastic scattering data

Abstract : We present a Next-to-Leading order perturbative QCD analysis of world data on the spin dependent structure functions g1p,g1ng_1^p, g_1^ng1p​,g1n​, and g1dg_1^dg1d​, including the new experimental information on the Q2Q^2Q2 dependence of g1ng_1^ng1n​. Careful attention is paid to the experimental and theoretical uncertainties. The data constrain the first moments of the polarized valence quark distributions, but only qualitatively constrain the polarized sea quark and gluon distributions. The NLO results are used to determine the Q2Q^2Q2 dependence of the ratio g1/F1g_1/F_1g1​/F1​ and evolve the experimental data to a constant Q2=5GeV2Q^2 = 5 GeV^2Q2=5GeV2. We determine the first moments of the polarized structure functions of the proton and neutron and find agreement with the Bjorken sum rule.
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Submitted on : Friday, June 11, 1999 - 3:40:46 PM
Last modification on : Tuesday, March 8, 2022 - 1:53:14 PM

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K. Abe, T. Akagi, B.D. Anderson, P.L. Anthony, R.G. Arnold, et al.. Next-to-leading order QCD analysis of polarized deep inelastic scattering data. Physics Letters B, Elsevier, 1997, 405, pp.180-190. ⟨10.1016/S0370-2693(97)00641-2⟩. ⟨in2p3-00002236⟩

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