We 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 α s 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. © 2012 Elsevier B.V.
|Journal||Nuclear Physics B - Proceedings Supplements|
|Publication status||Published - 1 Apr 2012|
- α s
- τ decay
- Duality violation