Mathematical aspects of the asymptotic expansion in contour improved perturbation theory for hadronic tau decays

Autor(en)

Néstor G. Gracia, André H. Hoang, Vicent Mateu

Abstrakt

In a previous work by one of the authors, it was demonstrated that the discrepancy between the fixed-order and contour-improved (CIPT) perturbative expansions for τ-lepton decay hadronic spectral function moments, which had been affecting the precision of αs determinations for many years, is related to the CIPT expansion being inconsistent with the standard formulation of the operator product expansion. Even though the problem can be alleviated phenomenologically for the most part by employing a renormalon-free scheme for the gluon-condensate matrix element, the principal inconsistency of CIPT remains. The CIPT expansion is special because it is not a power expansion, but represents an asymptotic expansion in a sequence of functions of the strong coupling. In this article we provide a closer look at the mathematical aspects of the asymptotic sequence of the functions the CIPT method is based on, and we expose the origin of the CIPT inconsistency as well as the reasons for its apparent good convergence at low orders. Our results are of general interest, and may in particular provide a useful tool to check for the consistency of expansion methods that are similar to CIPT.

Organisation(en)

Teilchenphysik

Externe Organisation(en)

Universidad de Salamanca

Journal

Physical Review D

Band

108

Anzahl der Seiten

21

ISSN

2470-0010

DOI

https://doi.org/0.48550/arXiv.2305.10288

Publikationsdatum

08-2023

Peer-reviewed

Ja

ÖFOS 2012

103012 Hochenergiephysik

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/1f8cbba1-929e-4924-a3ee-8c2046b33528