α<inf>s</inf> from the updated ALEPH data for hadronic τ decays

Diogo Boito, Maarten Golterman, Kim Maltman, James Osborne, Santiago Peris

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1 Citation (Scopus)

Abstract

© 2016 Elsevier B.V. We extract the strong coupling αs(mτ2) from the recently updated ALEPH non-strange spectral functions obtained from hadronic τ decays. We apply a self-consistent analysis method, first tested in the analysis of OPAL data, to extract αs(mτ2) and non-perturbative contributions. The analysis yields αsFO(mτ2)=0.296±0.010, using Fixed Order Perturbation Theory (FOPT), and αsCI(mτ2)=0.310±0.014, using Contour Improved Perturbation Theory (CIPT). The weighted average of these results with those previously obtained from OPAL data give αsFO(mτ2)=0.303±0.009 and αsCI(mτ2)=0.319±0.012, which gives, after evolution to the Z boson mass scale, αsFO(mZ2)=0.1165±0.0012 and αsCI(mZ2)=0.1185±0.0015, respectively. We observe that non-perturbative effects limit the accuracy with which αs can be extracted from τ decay data.
Original languageEnglish
Pages (from-to)103-107
JournalNuclear and Particle Physics Proceedings
Volume270-272
DOIs
Publication statusPublished - 1 Jan 2016

Keywords

  • Duality violations
  • α s
  • τ decays

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