Abstract: 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.
CIPT-FOPT discrepancy problem
22.03.2022 16:15 - 17:15
Organiser:
Teilchenphysik
Location: