Circling in on correlation functions in $\mathcal{N}=2$ orbifold theories
We review the harmonic superspace formalism for 4d $\mathcal{N}=2$ theories and apply it to orbifolds of $\mathcal N=4$ Super-Yang-Mills (SYM) theory. These theories have a remarkably similar description to $\mathcal N=4$ SYM, but their planar supergraphs feature topological twist lines which generate phases when inter...