A note on Wilson–ʼt Hooft operators

We find explicitly the geometry of certain moduli spaces of BPS configurations in the presence of ʼt Hooft operators. This is required to compute the Operator Product Expansion of Wilson–ʼt Hooft operators in N=4N=4 super-Yang–Mills theory with gauge group G=PSU(3)G=PSU(3). We verify our results by reproducing the OPE of ʼt Hooft operators predicted by S-duality.