Finiteness of N=4 supersymmetry sigma models
Kogan Ya. I., Morozov A. Yu. , Perelomov A. M.
A 2-D supersymmetry КЗ sigma model cannot be renormalized in all orders of perturbation theory. A case is made for the vanishing of the/? function for all N = 4 supersymmetric 2-D sigma models.