Chiral Quark Model of Nucleon Spin-Flavor Structure with SU(3) and Axial-U(1) Breakings

Abstract

The chiral quark model with a nonet of Goldstone bosons can yield an adequate description of the observed proton flavor and spin structure. In a previous publication we have compared the results of a SU(3) symmetric calculation with the phenomenological findings based on experimental measurements and SU(3) symmetry relations. In this paper we discuss their SU(3) and axial-U(1) breaking corrections. With two parameters, we obtain a very satisfactory fit to the F/D ratios for the octet baryon masses and for their axial vector couplings, as well as the different quark flavor contributions to the proton spin. The result also can account for, not only the light u and d quark asymmetry, but also the strange quark content, of the proton sea. SU(3) breaking is the key in reconciling the strange quark fraction as measured in the neutrino charm production and that as deduced from the pion nuleon sigma term.

16 pages, Latex (uses Revtex), to be submitted to Phys. Rev. D

Cited by in corpus (42)

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• Flavor Structure of the Nucleon Sea
• Why Naive Quark Model Can Yield a Good Account of the Baryon Magnetic Moments
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• Octet and Decuplet Baryon Magnetic Moments in the Chiral Quark Model
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• Magnetic moments of the low-lying {1/2}^- octet baryon resonances
• Magnetic Moments of Octet Baryons in Hot and Dense Nuclear Matter
• Magnetic moments of $J^P={\frac{3}{2}}^{+}$ decuplet baryons using effective quark masses in chiral constituent quark model
• x-Dependent Polarized Parton Distributions
• Spin and Flavor Strange Quark Content of the Nucleon
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• Chiral constituent quark model and the coupling strength of eta'
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• Quark sea asymmetries of the octet baryons
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• Polarized Structure of Nucleon in the Valon Representation
• Physics of the Nucleon Sea Quark Distributions
• Nucleon structure functions and longitudinal spin asymmetries in the chiral quark constituent model
• Chiral corrections to the vector and axial couplings of quarks and baryons
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• Charm Antiquark and Charm Quark in the Nucleon
• Electromagnetic and Axial-Vector Form Factors of the Quarks and Nucleon
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• Study of the $s-\bar{s}$ asymmetry in the proton
• Understanding the Flavor Symmetry Breaking and Nucleon Flavor-Spin Structure within Chiral Quark Model
• The Schwinger and Chiral Schwinger Models in a Non-perturbative Spectral Regularization
• Study of vector and axial-vector form factors and the decay parameters for the semileptonic hyperon decays
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