Abstract
We show that to order ${{\ensuremath{\alpha}}_{s}}^{2}$ in the quantum-chromodynamic coupling constant the effect of massive quarks on the vacuum polarization of chiral currents can be expressed in terms of the virtual forward photon-gluon scattering amplitude induced by a massless quark or, equivalently, in terms of the lowest-order annihilation rate of a virtual photon into a pair of massless quarks and a massive gluon. We evaluate these mass corrections for both a momentum-space subtraction scheme and the minimal-subtraction scheme and find them to be of moderate size.
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