Evidence for quark-hadron duality in the proton spin asymmetry A(1)

HERMES Collaboration

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Abstract

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 polarized positrons were scattered off a longitudinally polarized hydrogen target for values of Q(2) between 1.2 and 12 GeV2 and values of W-2 between 1 and 4 GeV2. 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 GeV2.
Original languageEnglish
Article number092002
Number of pages5
JournalPhysical Review Letters
Volume90
Issue number9
DOIs
Publication statusPublished - 7 Mar 2003
Externally publishedYes

Keywords

  • POLARIZED HYDROGEN
  • Q(2)-DEPENDENCE
  • CONSTRAINTS
  • POLARIMETER
  • RESONANCES
  • SCATTERING
  • BEHAVIOR
  • NEUTRON
  • SUM

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