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A Dyson-Schwinger model beyond isospin limit prepared for investigating U_A(1)-breaking temperature dependence

Motivated by our earlier findings of sensitive quark-flavor dependence of QCD topological susceptibility on products of current quark masses and corresponding condensates, we allow the breaking of isospin symmetry. For the purpose of future investigations of U_A(1) symmetry breaking and restoration at T>0, we perform (at T=0) refitting of the quark-mass parameters of a phenomenologically successful effective model of low-energy QCD. It belongs to the class of separable-interaction models within the Dyson-Schwinger approach to the quark-antiquark substructure of mesons.

quark substructure meson nonperturbative QCD Dyson-Schwinger isospin symmetry

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