Quark-Hadron Duality in Spin Structure Functions g1p and g1d

Details Quark-Hadron Duality in Spin Structure Functions g1p and g1d Quark-Hadron Duality in Spin Structure Functions g1p and g1d

2006-07-25

arxiv.org/abs/hep-ph/0607283v1

Phys.Rev.C75:035203,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 3 figures

Scientific paper

10.1103/PhysRevC.75.035203

New measurements of the spin structure functions of the proton and deuteron g1p(x,Q2) and g1d(x,Q2) in the nucleon resonance region are compared with extrapolations of target-mass-corrected next-to-leading-order (NLO) QCD fits to higher energy data. Averaged over the entire resonance region (W<2 GeV), the data and QCD fits are in good agreement in both magnitude and Q2 dependence for Q2>1.7 GeV2. This global duality appears to result from cancellations among the prominent local resonance regions: in particular strong sigma{3/2} contributions in the Delta(1232) region appear to be compensated by strong sigma{1/2} contributions in the resonance region centered on 1.5 GeV. These results are encouraging for the extension of NLO QCD fits to lower W and Q2 than have been used previously.

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