Issues in determining alpha(s) from hadronic tau decay and electroproduction data

Proceedings of the International Workshop on e+e− collisions from Phi to PsiWe discuss some key issues associated with duality-violating and non-perturbative OPE contributions to the theoretical representations of light quark current-current two-point functions and relevant to precision determinations of αs from hadronic τ decay and electroproduction cross-section data. We demonstrate that analyses with an explicit representation of duality-violating effects are required to bring theoretical errors in such extractions under control, motivating the accompanying paper in these proceedings, which presents the results of such an analysis.D. Boito, O. Catà, M. Golterman, M. Jamin, K. Maltman, J. Osborne, S. Peri