Question

What is $\mathcal{N}=2$ QED?

Answer 1

I would like to know is N=2N=2 QED is simply a N=2N=2theory with gauge group U(1)U(1) like in normal QED? If not, exactly what theory is it? Is there some reference for it

Answer 2

In particular in the case of the supersymmetric N = 2 QED we find complete degeneracy for para- ... On hydrogen-like bound states in $\mathcal{N}=4$ super Yang- Mills.