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We study QED corrections to the chiral symmetry breaking inNambu-Jona-Lasinio (NJL) model with two flavors of quarks. In the model theisospin symmetry is broken by differences of the current quark masses and theelectromagnetic charges between up and down quarks. In the leading order of the1/N expansion we calculate the effective potential of the model with one-loopQED corrections. Evaluating the effective potential, we study an influence ofthe isospin symmetry breaking on the orientation of chiral symmetry breaking.The current quark mass has an important contribution for the orientation ofchiral symmetry breaking.Comment: 7 pages, 8 figures, To appear in the proceedings of the Workshop on  Origin of Mass and Strong Coupling Gauge Theories, Nagoya, Japan, 21-24  November 200

PHASE STRUCTURE OF NJL MODEL WITH FINITE QUARK MASS AND QED CORRECTION