A renormalization scheme is identified for N=2 supersymmetric integrable sigma models in which the five-loop beta-function contribution vanishes and the fourth-loop term becomes a coordinate-independent invariant for T-duals of eta-deformed SU(n)/U(n-1) and eta/lambda-deformed SU(2)/U(1) models.
Zumino,Supersymmetry and K¨ ahler Manifolds,Phys
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On $\beta$-function of $\mathcal{N}=2$ supersymmetric integrable sigma models II
A renormalization scheme is identified for N=2 supersymmetric integrable sigma models in which the five-loop beta-function contribution vanishes and the fourth-loop term becomes a coordinate-independent invariant for T-duals of eta-deformed SU(n)/U(n-1) and eta/lambda-deformed SU(2)/U(1) models.