Correction exponents at 1/N^{2} in the chiral Heisenberg model agree with 4−ε results but one pole at d=3 is resummed via four-fermion mixing, modifying leading-order 3D exponents consistently with direct calculation.
Gracey, Computation of the three loop Beta function of the O(N) Gross-Neveu model in minimal subtraction
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Correction exponents in the chiral Heisenberg model at $1/N^2$: singular contributions and operator mixing
Correction exponents at 1/N^{2} in the chiral Heisenberg model agree with 4−ε results but one pole at d=3 is resummed via four-fermion mixing, modifying leading-order 3D exponents consistently with direct calculation.