Quark Spin Contents of Proton and Mass Difference Between Ξ and Δ

摘要

Using the flavor-singlet axial current of 0(1) in the large Nc expansion and the Skyrme model with BuBu term (6-derivative term),we calculate the quark spin contents of proton and various static observables of the baryons.It is found that the problem of the crossing between the mass spectra of the octet and decuplet in SU(3) can be solved naturally.The numerical results are compatible with experimental data.