The Spin-dependent Structure Function of the Proton g_1^p and a Test of the Bjorken Sum Rule

et al; The COMPASS Collaboration: M.G. Alekseev

The Spin-dependent Structure Function of the Proton g₁^p and a Test of the Bjorken Sum Rule

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arxiv 1001.4654 v1 pith:XAJRTYCR submitted 2010-01-26 hep-ex

The Spin-dependent Structure Function of the Proton g₁^p and a Test of the Bjorken Sum Rule

The COMPASS Collaboration: M.G. Alekseev , et al This is my paper

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keywords bjorkendeltafunctionpolarisedprotonrulespin-dependentstructure

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The inclusive double-spin asymmetry, A_1^p, has been measured at COMPASS in deepinelastic polarised muon scattering off a large polarised NH3 target. The data, collected in the year 2007, cover the range Q2 > 1 (GeV/c)^2, 0.004 < x < 0.7 and improve the statistical precision of g_1^p(x) by a factor of two in the region x < 0.02. The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g_1^NS(x,Q2). The isovector quark density, Delta_q_3(x,Q2), is evaluated from a NLO QCD fit of g_1^NS. The first moment of Delta_q3 is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants g_A/g_V = 1.28+-0.07(stat)+-0.10(syst).

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