New relations and constraints on quark spin-flavor content in the symmetry-breaking chiral quark model
- Institute of Nuclear and Particle Physics, Department of Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)
New relations between the quark spin-flavor contents of the nucleon and axial weak coupling constants are obtained in the chiral quark model with both SU(3)- and U(1)-breaking effects. Using the nonsinglet spin combinations {Delta}{sub 3} and {Delta}{sub 8}, all spin-flavor observables are functions of only one parameter a{emdash}the probability for the chiral pionic fluctuation. The upper and lower bounds of these observables are given. The optimum range of a, determined by NMC data {bar d}{minus}{bar u}, gives a constraint to the cutoff of the chiral quark field theory. The model predictions are in good agreement with the existing data in this range of a. The roles of the kaon, {eta} and {eta}{sup {prime}} are also discussed. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 597251
- Journal Information:
- Physical Review, D, Vol. 57, Issue 7; Other Information: PBD: Apr 1998
- Country of Publication:
- United States
- Language:
- English
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