New determination of αs from hadronic τ decays

Diogo Boito, Oscar Catà, Maarten Golterman, Matthias Jamin, Kim Maltman, James Osborne, and Santiago Peris
Phys. Rev. D 84, 113006 – Published 13 December 2011

Abstract

We present a new framework for the extraction of the strong coupling from hadronic τ decays through finite-energy sum rules. Our focus is on the small, but still significant nonperturbative effects that, in principle, affect both the central value and the systematic error. We employ a quantitative model in order to accommodate violations of quark-hadron duality, and enforce a consistent treatment of the higher-dimensional contributions of the operator product expansion to our sum rules. Using 1998 OPAL data for the nonstrange isovector vector and axial-vector spectral functions, we find the nf=3 values αs(mτ2)=0.307±0.019 in fixed-order perturbation theory, and 0.322±0.026 in contour-improved perturbation theory. For comparison, the original OPAL analysis of the same data led to the values 0.324±0.014 (fixed order) and 0.348±0.021 (contour improved).

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  • Received 13 October 2011

DOI:https://doi.org/10.1103/PhysRevD.84.113006

© 2011 American Physical Society

Authors & Affiliations

Diogo Boito1, Oscar Catà2,3, Maarten Golterman4, Matthias Jamin5, Kim Maltman6,7, James Osborne4, and Santiago Peris4,*

  • 1Departament de Física and IFAE, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
  • 2Departament de Física Teòrica and IFIC, Universitat de València-CSIC, E-46071 València, Spain
  • 3Ludwig-Maximilians-Universität München, Fakultät für Physik, Arnold Sommerfeld Center for Theoretical Physics, D80333 München, Germany
  • 4Department of Physics and Astronomy, San Francisco State University, San Francisco, California 94132, USA
  • 5Institució Catalana de Recerca i Estudis Avançats, IFAE, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
  • 6Department of Mathematics and Statistics, York University, Toronto, Ontario, Canada M3J 1P3
  • 7CSSM, University of Adelaide, Adelaide, South Australia 5005 Australia

  • *Permanent address: Departament de Física, Universitat Autonòma de Barcelona, E-08193 Bellaterra, Barcelona, Spain.

See Also

Updated determination of αs from τ decays

Diogo Boito, Maarten Golterman, Matthias Jamin, Andisheh Mahdavi, Kim Maltman, James Osborne, and Santiago Peris
Phys. Rev. D 85, 093015 (2012)

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Vol. 84, Iss. 11 — 1 December 2011

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