Evidence for Quark-Hadron Duality in the Proton Spin Asymmetry $A_1$

Details Evidence for Quark-Hadron Duality in the Proton Spin Asymmetry $A_1$ Evidence for Quark-Hadron Duality in the Proton Spin Asymmetry $A_1$

2002-09-10

arxiv.org/abs/hep-ex/0209018v2

Phys.Rev.Lett.90:092002,2003

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 1 eps figure, table added, new references added, in print in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.90.092002

Spin-dependent lepton-nucleon scattering data have been used to investigate the validity of the concept of quark-hadron duality for the spin asymmetry $A_1$. Longitudinally polarised positrons were scattered off a longitudinally polarised hydrogen target for values of $Q^2$ between 1.2 and 12 GeV$^2$ and values of $W^2$ between 1 and 4 GeV$^2$. The average double-spin asymmetry in the nucleon resonance region is found to agree with that measured in deep-inelastic scattering at the same values of the Bjorken scaling variable $x$. This finding implies that the description of $A_1$ in terms of quark degrees of freedom is valid also in the nucleon resonance region for values of $Q^2$ above 1.6 GeV$^2$.

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