Double fermionic contributions to the heavy-quark vacuum polarization
arXiv:0712.2762 · doi:10.1088/1126-6708/2008/07/001
Abstract
We compute the virtual O(α_s^3 n_f^2) corrections to the heavy quark vector current correlator in terms of expansions in the external momentum and as an exact numerical solution. As a byproduct, the available high-energy expansion at the three-loop level is extended.
12 pages, 5 figures