Mean-field expansion and meson effects in chiral condensate of analytically regularized Nambu -- Jona-Lasinio model
R. G. Jafarov, V. E. Rochev
Abstract
Scalar meson contributions in chiral quark condensate are calculated for analytically regularized Nambu -- Jona-Lasinio model in framework of mean-field expansion in bilocal-source formalism. Sigma-meson contribution for physical values of parameters is found to be small. Pion contribution is found to be significant and should be taken into account at the choice of the parameter values.
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