Exact Adler Function in Supersymmetric QCD

Understand

The Adler function D is found {\em exactly} in supersymmetric QCD.

• Our exact formula relates D(Q^2) to the anomalous dimension of the matter superfields \gamma (\alpha_s(Q^2)).
• En rout we prove another theorem: the absence of the so-called singlet contribution to D.
• While such singlet contributions are present in individual supergraphs, they cancel in the sum.