High Quality Content by WIKIPEDIA articles! In quantum field theory, the Nambu–Jona–Lasinio model is a theory of nucleons and mesons constructed from interacting Dirac fermions with chiral symmetry which parallels the construction of Cooper pairs from electrons in the BCS theory of superconductivity. It was introduced by Yoichiro Nambu and Giovanni Jona-Lasinio in 1961. They then included chiral symmetry breaking, isospin and strangeness. It is an example of a four fermion interaction. This model is defined in a spacetime with an even number of dimensions.

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