Abstract
A Nambu-Jona-Lasinio model with vector interactions is considered. Vector mesons are found to reduce significantly the partial restoration of chiral symmetry at normal nuclear density. The quark loop term is expanded in terms of the field amplitudes thus yielding on-shell meson masses. Results are compared with those obtained in gradient expansions. The model can describe on-shell π, ρ and ω mesons as bound qq̄ excitations but it is unable to form bound a1 and f1 mesons.
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