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Higher Dimension Operators and Chiral Symmetry Breaking in Nambu-Jona-Lasinio Model
Lee, T, Oh, Yu
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Abstract
We point out that adding higher dimension operators to the Nambu-Jona-Lasinio model can stabilize chiral symmetry breaking and resolve the issue raised by Kleinert and Van den Bossche that chiral symmetry breaking cannot occur for $N_c \\le N_c^{{\\rm cr}}$ due to large quantum fluctuations of the composite fields.