3 research outputs found

    New Relations and Constraints on Quark Spin-flavor Contents in Symmetry-breaking Chiral Quark Model

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    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, Δ3\Delta_3 and Δ8\Delta_8, all spin-flavor observables are functions of only one parameter aa −- probability for the chiral pionic fluctuation. The upper and lower bounds of these observables are given. The optimal range of aa, determined by NMC data dˉ−uˉ\bar d-\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 aa. The roles of kaon, η\eta and η′\eta' are also discussed.Comment: 20 pages, Revtex, 3 tables, 4 figure

    Structures generated by invariants

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