Chiral quark model analysis of nucleon quark sea isospin asymmetry and spin polarization

Abstract

We analyze recent measurements of the nucleon quark sea isospin asymmetry in terms of the chiral quark model. The new measurements indicate that the SU(3) model with modest symmetry breaking and no ${\eta }^{\prime }$ Goldstone boson gives a satisfactory description of data. We also discuss the matching parameter for the axial-vector current. Finally, we analyze the nucleon quark spin polarization measurements directly in the chiral quark model without using any SU(3) symmetry assumption on the hyperon axial-vector form factors. The new data indicate that the chiral quark model gives a remarkably good and consistent description of all low energy baryon measurements.

7 pages, 3 figures, EPJ LaTeX

Cited by in corpus (8)

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• Chiral constituent quark model and the coupling strength of eta'
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• $x-$dependence of the quark distribution functions in the $\chi$CQM${}_{\mathrm{config}}$
• Orbital Angular Momentum in the Nucleon
• An Alternative Method to Obtain the Quark Polarization of the Nucleon
• Study of vector and axial-vector form factors and the decay parameters for the semileptonic hyperon decays