  We report an exact solution of 2- and 3-point functions of chiral primary
fields in SU(2) N=2 super-Yang-Mills theory coupled to four hypermultiplets. It
is shown that these correlation functions are non-trivial functions of the
gauge coupling, obeying differential equations which take the form of the
semi-infinite Toda chain. We solve these equations recursively in terms of the
Zamolodchikov metric that can be determined exactly from supersymmetric
localization on the four-sphere. Our results are verified independently in
perturbation theory with a Feynman diagram computation up to 2-loops. This is a
short version of a companion paper that contains detailed technical remarks,
additional material and aspects of an extension to SU(N) gauge group.
