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Dynamical Symmetry breaking and meson masses are studied in theNambu-Jona-Lasinio (NJL) model at finite temperature and chemical potentialusing the dimensional regularization. Since the model is not renormalizable infour space-time dimensions, physical results and parameters depend on theregularization method. Following the imaginary time formalism, we introduce thetemperature, $T$ and the chemical potential, $\mu$. The parameters in the modelare fixed by calculating the pion mass and decay constant in the dimensionalregularization at $T=\mu=0$.

$\pi$ and $\sigma$ mesons at finite temperature and density in the NJL model with dimensional regularization