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Phys. Rev. Lett. 90, 092002 (2003) [5 pages]

Evidence for Quark-Hadron Duality in the Proton Spin Asymmetry A1
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A. Airapetian et al. HERMES Collaboration
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Received 11 September 2002; published 4 March 2003

Spin-dependent lepton-nucleon scattering data have been used to investigate the validity of the concept of quark-hadron duality for the spin asymmetry A1. Longitudinally polarized positrons were scattered off a longitudinally polarized hydrogen target for values of Q2 between 1.2 and 12  GeV2 and values of W2 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 A1 in terms of quark degrees of freedom is valid also in the nucleon resonance region for values of Q2 above 1.6  GeV2.


©2003 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v90/e092002
DOI: 10.1103/PhysRevLett.90.092002
PACS: 13.60.Hb, 12.40.–y, 13.88.+e

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