N = 4 SYM on ∑ × S2 and its topological reduction Original Research Article

We consider the twisted N = 4 SYM on ∑ × S2. In the limit that S2 shrinks to zero size the four-dimensional theory reduces to a two-dimensional SYM theory. We compute the correlation functions of a set of BRST cohomology classes in the reduced theory perturbed by mass.