Analytic QCD coupling with no power terms in UV regime
Gorazd Cvetic, Reinhart Koegerler, and Cristian Valenzuela
TL;DR
This paper develops analytic QCD models with a running coupling free of Landau singularities, resolving issues related to UV power terms and tau decay ratios by constructing suitable nonperturbative beta functions.
Contribution
It introduces new analytic QCD models that eliminate UV power terms and improve agreement with experimental tau decay data.
Findings
Models are free of Landau singularities.
Enhanced compatibility with ITEP-OPE philosophy.
Better predictions for tau decay ratios.
Abstract
We construct models of analytic QCD (i.e.,with the running coupling parameter free of Landau singularities) which address several problems encountered in previous analytic QCD models, among them their incompatibility with the ITEP-OPE philosophy (due to UV power terms) and too low values of the semihadronic tau decay ratio. The starting point of the approach is the construction of appropriate nonperturbative beta functions.
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