Chiral Quark Model with Configuration Mixing

Abstract

The implications of one gluon exchange generated configuration mixing in the Chiral Quark Model ($\chi$QM${}_{gcm}$) with SU(3) and axial U(1) symmetry breakings are discussed in the context of proton flavor and spin structure as well as the hyperon $\beta$-decay parameters. We find that $\chi$QM${}_{gcm}$ with SU(3) symmetry breaking is able to give a satisfactory unified fit for spin and quark distribution functions, with the symmetry breaking parameters $\alpha =.4$, $\beta =.7$ and the mixing angle $\varphi =20^o$, both for NMC and the most recent E866 data. In particular, the agreement with data, in the case of $G_A/G_V,{\Delta }_8$, F, D, $f_s$ and $f_3/f_8$, is quite striking.

16 pages, LaTex, Table and Appendix added

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• dbar/ubar Asymmetry and the Origin of the Nucleon Sea
• Chiral Quark Model of Nucleon Spin-Flavor Structure with SU(3) and Axial-U(1) Breakings
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• Magnetic moments of $J^P={\frac{3}{2}}^{+}$ decuplet baryons using effective quark masses in chiral constituent quark model
• Spin and Flavor Strange Quark Content of the Nucleon
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• Quark scalar, axial, and pseudoscalar charges in the Schwinger-Dyson formalism
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• Nucleon structure functions and longitudinal spin asymmetries in the chiral quark constituent model
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• On Parametrization of the Linear GL(4,C) and Unitary SU(4) Groups in Terms of Dirac Matrices
• Strangeness and Chiral Symmetry Breaking
• Electromagnetic and Axial-Vector Form Factors of the Quarks and Nucleon
• Axial-vector charges of the spin ${\frac{1}{2}}^{+}$ and spin ${\frac{3}{2}}^{+}$ light and charmed baryons in the SU(4) chiral quark constituent model
• Understanding the Flavor Symmetry Breaking and Nucleon Flavor-Spin Structure within Chiral Quark Model
• Study of vector and axial-vector form factors and the decay parameters for the semileptonic hyperon decays