Di Vecchia, PaoloTanzini, Alessandro2007-10-292011-09-072007-10-292011-09-072007-10-29https://openscience.sissa.it/handle/1963/2309Contributed to NATO Advanced Study Institute and EC Summer School on String Theory: From Gauge Interactions to Cosmology, Cargese, France, 7-19 Jun 2004.We show that the complete planar one-loop mixing matrix of the N=2 Super Yang--Mills theory can be obtained from a reduction of that of the N=4 theory. For composite operators of scalar fields, this yields an anisotropic XXZ spin chain, whose spectrum of excitations displays a mass gap.110673 bytesapplication/pdfen-USPreprint