α s analyses from hadronic tau decays with OPAL and ALEPH data

Diogo Boito, Maarten Golterman, Kim Maltman, Santiago Peris

Research output: Contribution to journalReview articleResearchpeer-review

1 Citation (Scopus)

Abstract

© 2016 World Scientific Publishing Company. Recently, we extracted the strong coupling, αs(mτ2), from the revised ALEPH data for non-strange hadronic tau decays. Our analysis is based on a method previously used for the determination of the strong coupling from OPAL data. In our strategy, we employ different moments of the spectral functions both with and without pinching, including duality violations, in order to obtain fully self-consistent analyses that do not rely on untested assumptions (such as the smallness of higher dimension contributions in the operation product expansion (OPE)). Here we discuss the αs values obtained from the ALEPH and the OPAL data, the robustness of the analysis, as well as non-perturbative contributions from DVs and the OPE. We show that, although the αs determination is sound, non-perturbative effects limit the accuracy with which one can extract the strong coupling from tau decay data. Finally, we discuss the compatibility of the data sets and the possibility of a combined analysis.
Original languageEnglish
Article number1630024
JournalModern Physics Letters A
Volume31
Issue number26
DOIs
Publication statusPublished - 30 Aug 2016

Keywords

  • QCD
  • Strong coupling
  • tau decays

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