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Two flavor QCD involves three independent mass parameters for which non-perturbative effects are not universal.
K. Fujikawa, Phys. Rev. Lett. 42
1980
Earlier work this paper cites.
H. Georgi and I. N. McArthur, Harvard University preprint HUTP-81/A011 (1981, unpublished); T. Banks, Y. Nir and N. Seiberg, arXiv:hep-ph/9403203; M. Creutz, arXiv:hep-th/0303254 (2003, unpublished); M. Creutz, Phys. Rev. Lett. 92
2004
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