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In this paper we derive the exact expression of the four-spinon contribution to the dynamical correlation function of the spin S = 12 anisotropic (XXZ) Heisenberg model in the antiferromagnetic regime. We extensively study its isotropic (XXX) limit and derive perturbatively the Ising one. Our method relies on the quantum affine symmetry of the model, which allows for a systematic diagonalization...
Within the Nambu-Jona-Lasinio model strange degrees of freedom are incorporated into the soliton picture using the collective approach of Yabu and Ando. The form factors of the nucleon associated with the nonet vector current are extracted. The numerical results provide limits for the strange magnetic moment: -0.05 ≤ μ s ≤ 0.25. For the strange magnetic form factor of the nucleon the valence...
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