Hadronic contribution to $\alpha (M_Z^2)$ and the anomalous magnetic moment of the muon

Abstract

In this contribution recent developments are discussed which lead to a significant reduction of the error for $\alpha (M_Z^2)$ and $(g-2{)}_{\mu }$.

6 pages, Talk presented at the 17th International Workshop on Weak Interactions and Neutrinos (WIN99), Cape Town, South Africa, January 24--30, 1999