Airapetian, A. and Filippone, B. W. and Tipton, B. (2003) Evidence for Quark-Hadron Duality in the Proton Spin Asymmetry A_1. Physical Review Letters, 90 (9). Art. No. 092002. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20111019-154653105
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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 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.
|Additional Information:||© 2003 The American Physical Society. Received 11 September 2002; published 4 March 2003. We gratefully acknowledge the DESY management for its support, the staffs at DESY and the collaborating institutions for their significant effort, and our funding agencies for financial support. This work was supported by the FWO-Flanders, Belgium; the Natural Sciences and Engineering Research Council of Canada; the INTAS and ESOP network contributions from the European Community; the German Bundesministerium für Bildung und Forschung; the Deutsche Forschungsgemeinschaft (DFG); the Deutscher Akademisches Austauschdienst (DAAD); the Italian Istituto Nazionale di Fisica Nucleare (INFN); Monbusho International Scientific Research Program, JSPS, and Toray Science Foundation of Japan; the Dutch Foundation for Fundamenteel Onderzoek der Materie (FOM); the U.K. Particle Physics and Astronomy Research Council; and the U.S. Department of Energy and the National Science Foundation.|
|Classification Code:||PACS: 13.60.Hb, 12.40.–y, 13.88.+e|
|Official Citation:||Evidence for Quark-Hadron Duality in the Proton Spin Asymmetry A1 A. Airapetian et al. (HERMES Collaboration) Published 4 March 2003 (5 pages) 092002|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||20 Oct 2011 19:57|
|Last Modified:||26 Dec 2012 14:17|
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