Nambu-Jona-Lasinio model used to investigate low energy phenomena is nonrenormalizable, therefore the results depend on the regularization parameter in general. A possibility of the finite in four-dimensional limit and even the regularization parameter (this is dimension in the dimensional regularization scheme) independent analysis is shown in the leading order of the 1/Nc expansion.
@article{arxiv.1302.5667,
title = {Regularization parameter independent analysis in Nambu-Jona-Lasinio model},
author = {T. Inagaki and D. Kimura and H. Kohyama and A. Kvinikhidze},
journal= {arXiv preprint arXiv:1302.5667},
year = {2015}
}