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Title: Quark-hadron duality in spin structure functions g{sub 1}{sup p} and g{sub 1}{sup d}

Abstract

New measurements of the spin structure functions of the proton and deuteron g{sub 1}{sup p}(x,Q{sup 2}) and g{sub 1}{sup d}(x,Q{sup 2}) 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 Q{sup 2} dependence for Q{sup 2}>1.7 GeV{sup 2}/c{sup 2}. This ''global'' duality appears to result from cancellations among the prominent ''local'' resonance regions: in particular strong {sigma}{sub 3/2} contributions in the {delta}(1232) region appear to be compensated by strong {sigma}{sub 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 Q{sup 2} than have been used previously.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States) (and others)
Publication Date:
OSTI Identifier:
20995162
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.75.035203; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; DELTA-1232 BARYONS; DEUTERONS; EXTRAPOLATION; GEV RANGE 01-10; PROTONS; QUANTUM CHROMODYNAMICS; QUARK-HADRON INTERACTIONS; RESONANCE; SPIN; STRUCTURE FUNCTIONS

Citation Formats

Bosted, P. E., Brooks, W. K., Burkert, V. D., Cords, D., Degtyarenko, P. V., Deur, A., Guo, L., Gyurjyan, V., Ito, M. M., Keith, C., Manak, J. J., Mecking, B. A., Mestayer, M. D., Niczyporuk, B. B., Nozar, M., Sharabian, Y. G., Smith, E. S., Thoma, U., Weygand, D. P., and Wolin, E.. Quark-hadron duality in spin structure functions g{sub 1}{sup p} and g{sub 1}{sup d}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.035203.
Bosted, P. E., Brooks, W. K., Burkert, V. D., Cords, D., Degtyarenko, P. V., Deur, A., Guo, L., Gyurjyan, V., Ito, M. M., Keith, C., Manak, J. J., Mecking, B. A., Mestayer, M. D., Niczyporuk, B. B., Nozar, M., Sharabian, Y. G., Smith, E. S., Thoma, U., Weygand, D. P., & Wolin, E.. Quark-hadron duality in spin structure functions g{sub 1}{sup p} and g{sub 1}{sup d}. United States. doi:10.1103/PHYSREVC.75.035203.
Bosted, P. E., Brooks, W. K., Burkert, V. D., Cords, D., Degtyarenko, P. V., Deur, A., Guo, L., Gyurjyan, V., Ito, M. M., Keith, C., Manak, J. J., Mecking, B. A., Mestayer, M. D., Niczyporuk, B. B., Nozar, M., Sharabian, Y. G., Smith, E. S., Thoma, U., Weygand, D. P., and Wolin, E.. Thu . "Quark-hadron duality in spin structure functions g{sub 1}{sup p} and g{sub 1}{sup d}". United States. doi:10.1103/PHYSREVC.75.035203.
@article{osti_20995162,
title = {Quark-hadron duality in spin structure functions g{sub 1}{sup p} and g{sub 1}{sup d}},
author = {Bosted, P. E. and Brooks, W. K. and Burkert, V. D. and Cords, D. and Degtyarenko, P. V. and Deur, A. and Guo, L. and Gyurjyan, V. and Ito, M. M. and Keith, C. and Manak, J. J. and Mecking, B. A. and Mestayer, M. D. and Niczyporuk, B. B. and Nozar, M. and Sharabian, Y. G. and Smith, E. S. and Thoma, U. and Weygand, D. P. and Wolin, E.},
abstractNote = {New measurements of the spin structure functions of the proton and deuteron g{sub 1}{sup p}(x,Q{sup 2}) and g{sub 1}{sup d}(x,Q{sup 2}) 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 Q{sup 2} dependence for Q{sup 2}>1.7 GeV{sup 2}/c{sup 2}. This ''global'' duality appears to result from cancellations among the prominent ''local'' resonance regions: in particular strong {sigma}{sub 3/2} contributions in the {delta}(1232) region appear to be compensated by strong {sigma}{sub 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 Q{sup 2} than have been used previously.},
doi = {10.1103/PHYSREVC.75.035203},
journal = {Physical Review. C, Nuclear Physics},
number = 3,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}