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Improved Effective Action for Light Quarks Beyond Chiral Limit

We propose an improvement of the Diakonov-Petrov Effective Action on the basis of the Lee-Bardeen results for the quark determinant in the instanton field. This Improved Effective Action provides proper account of the current quark masses, which is particularly important for strange quarks. This Action is successfully tested by the calculations of the quark condensate, the masses of the pseudoscalar meson octet and by axial-anomaly low-energy theorems.

preprint1999arXivOpen access
M. Musakhanov
hep-ph
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M. Musakhanov

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