@Article{Boito_etal2011,
author="Boito, D.
and Cata, O.
and Golterman, M.
and Jamin, M.
and Maltman, K.
and Osborne, J.
and Peris, S.",
title="New determination of alpha(s) from hadronic tau decays",
journal="Physical Review D",
year="2011",
publisher="Amer Physical Soc",
volume="84",
number="11",
pages="113006--19pp",
abstract="We present a new framework for the extraction of the strong coupling from hadronic tau 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 n(f) = 3 values alpha(s)(m(tau)(2)) = 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).",
optnote="WOS:000298131000001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=847), last updated on Wed, 18 Jan 2012 10:03:08 +0000",
issn="1550-7998",
doi="10.1103/PhysRevD.84.113006",
opturl="http://arxiv.org/abs/arXiv:1110.1127",
opturl="https://doi.org/10.1103/PhysRevD.84.113006",
archivePrefix="arXiv",
eprint="arXiv:1110.1127",
language="English"
}