The discrepancy between Fixed-Order Perturbation Theory (FOPT) and Contour-Improved Perturbation Theory (CIPT) for the hadronic tau decay constitutes a major theoretical uncertainty for strong coupling determinations from hadronic tau decay spectral data.
I will introduce a scheme for a renormalon-free gluon condensate (GC) matrix element, which is capable of resolving the FOPT-CIPT discrepancy problem.
Furthermore I will talk about different methods of obtaining a norm for the GC, which is needed in the new GC scheme, and show first results of phenomenological applications.
In this context I will revisit studies from the past and discuss the implications of our new scheme on the strong coupling predictions.
Miguel Benitez-Rathgeb (Vienna): CIPT-FOPT discrepancy problem
Location:
