Large Wilson loops with overlap and clover fermions: Two-loop evaluation of the b-quark mass shift and the quark–antiquark potential Original Research Article

We compute, to two loops in perturbation theory, the fermionic contribution to rectangular image Wilson loops, for different values of R and T. We use the overlap fermionic action. We also employ the clover action, for comparison with existing results in the literature. In the limit image our results lead to the shift in the static quark energy, which can be used to determine the b-quark mass. We also evaluate the perturbative static potential as image.