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doi:10.1016/0550-3213(88)90127-7 
Copyright © 1988 Published by Elsevier Science B.V. All rights reserved.
Strangeness mixing and quenching in the Nambu-Jona-Lasinio model*1
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R. L. Jaffe and U. -G. Meissner
Received 11 January 1988;
Abstract
We study the mixing of quarks of one flavor into the wavefunction of constituent quarks of a different flavor when chiral symmetry breaks dynamically in the Nambu-Jona-Lasinio model. First we generalize the Nambu-Jona-Lasino model to Nƒ flavors including U(1)A symmetry breaking by a 2Nƒ-fermion interaction. In the Hartree-Fock approximation, this term is entirely responsible for flavor mixing. We specialize to three flavors and use meson properties and vacuum quark condensates to fix the three parameters of the model. We show that there are generically two different regimes in the broken chiral symmetry phase. Non-linearities in the strange quark mass are strong in the “barely broken regime”, allowing for a large Σ-term and a small s-quark content of the proton. In the “firmly broken regime”, non-linearities in ms, are small, chiral perturbation theory is likely to be reliable and the Σ-term is small. We also study deep inelastic scattering and demonstrate that dynamical chiral symmetry breaking gives rise to a non-negligible s-parton distribution.
Article Outline
*1 This work is supported in part by funds provided by the U S Department of Energy (DOE) under contract #DE-AC02-76ER03069.
