New Relations and Constraints on Quark Spin-flavor Contents in Symmetry-breaking Chiral Quark Model
Song, X.
Original · EN
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 and Δ₈, all spin-flavor observables are functions of only one parameter a - probability for the chiral pionic fluctuation. The upper and lower bounds of these observables are given. The optimal range of a, determined by NMC data d- 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 kaon, η and η' are also discussed.
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