Spin structure of nucleons in a quark model with constituent gluons

Zhenping Li; Gabriel Karl

doi:10.1103/PhysRevD.49.2620

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Spin structure of nucleons in a quark model with constituent gluons

Zhenping Li

Gabriel Karl

Physics Department, Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213-3890

Physics Department, University of Guelph, Guelph, Ontario, Canada N1G 2W1

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Phys. Rev. D 49, 2620 – Published 1 March, 1994

DOI: https://doi.org/10.1103/PhysRevD.49.2620

Abstract

We discuss the spin structure of nucleons in a quark model with gluonic degrees of freedom. The sum rules for polarized protons and neutrons are related to nucleon magnetic moments. In particular, when the ratio of the proton and neutron magnetic moments is larger than $- \frac{3}{2}$ the sum rule for polarized neutrons is negative, in agreement with recent experiments.

References (14)

M. Chanowitz and S. R. Sharpe, Nucl. Phys. B222, 211 (1983) T. Barnes, F. Close, and F. De Viron, ibid. B224, 241 (1983) T. Barnes, Ph.D. thesis, Caltech, 1977 Nucl. Phys. B158, 171 (1979) F. De Viron and J. Weyers, ibid. B185, 391 (1981)
E. Golowich, E. Haqq, and G. Karl, Phys. Rev. D 28, 160 (1983) T. Barnes and F. E. Close, Phys. Lett. 123B, 89 (1983)
T. Barnes and F. E. Close, Phys. Lett. 128B, 277 (1983)
Zhenping Li, Phys. Rev. D 44, 2841 (1991)
Zhenping Li, V. Burkert, and Zhujun Li, Phys. Rev. D 46, 70 (1992)
F. Wagner, in I. Perturbative QCD and Electroweak Interactions, Proceedings of the XVIth Rencontre de Moriond, Les Arcs, France, 1981, edited by J. Tran Thanh Van (Editions Frontieres, Gif-sur-Yvette, 1981)
H. J. Lipkin, Phys. Lett. B 251, 613 (1990)
H. Fritzsch, Phys. Lett. B 229, 429 (1939)
J. Ashman et al., Nucl. Phys. B328, 1 (1989)
Zhenping Li, Phys. Rev. D 47, 1854 (1993)
J. D. Bjorken, Phys. Rev. 148, 1467 (1966) Phys. Rev. D 1, 1376 (1970)
F. E. Close, Introduction to Quarks and Partons (Academic, New York, 1979)
Spin-Muon-Collaboration (SMC), Phys. Lett. B 302, 533 (1993)
R. L. Jaffe and H. J. Lipkin, Phys. Lett. B 266, 458 (1991)

[c1] M. Chanowitz and S. R. Sharpe, Nucl. Phys. B222, 211 (1983) T. Barnes, F. Close, and F. De Viron, ibid. B224, 241 (1983) T. Barnes, Ph.D. thesis, Caltech, 1977 Nucl. Phys. B158, 171 (1979) F. De Viron and J. Weyers, ibid. B185, 391 (1981)

[c2] E. Golowich, E. Haqq, and G. Karl, Phys. Rev. D 28, 160 (1983) T. Barnes and F. E. Close, Phys. Lett. 123B, 89 (1983)

[c3] T. Barnes and F. E. Close, Phys. Lett. 128B, 277 (1983)

[c4] Zhenping Li, Phys. Rev. D 44, 2841 (1991)

[c5] Zhenping Li, V. Burkert, and Zhujun Li, Phys. Rev. D 46, 70 (1992)

[c6] F. Wagner, in I. Perturbative QCD and Electroweak Interactions, Proceedings of the XVIth Rencontre de Moriond, Les Arcs, France, 1981, edited by J. Tran Thanh Van (Editions Frontieres, Gif-sur-Yvette, 1981)

[c7] H. J. Lipkin, Phys. Lett. B 251, 613 (1990)

[c8] H. Fritzsch, Phys. Lett. B 229, 429 (1939)

[c9] J. Ashman et al., Nucl. Phys. B328, 1 (1989)

[c10] Zhenping Li, Phys. Rev. D 47, 1854 (1993)

[c11] J. D. Bjorken, Phys. Rev. 148, 1467 (1966) Phys. Rev. D 1, 1376 (1970)

[c12] F. E. Close, Introduction to Quarks and Partons (Academic, New York, 1979)

[c13] Spin-Muon-Collaboration (SMC), Phys. Lett. B 302, 533 (1993)

[c14] R. L. Jaffe and H. J. Lipkin, Phys. Lett. B 266, 458 (1991)

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Spin structure of nucleons in a quark model with constituent gluons

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