%0 Journal Article
%T New determination of alpha(s) from hadronic tau decays
%A Boito, D.
%A Cata, O.
%A Golterman, M.
%A Jamin, M.
%A Maltman, K.
%A Osborne, J.
%A Peris, S.
%J Physical Review D
%D 2011
%V 84
%N 11
%I Amer Physical Soc
%@ 1550-7998
%G English
%F Boito_etal2011
%O WOS:000298131000001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=847), last updated on Wed, 18 Jan 2012 10:03:08 +0000
%X 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).
%R 10.1103/PhysRevD.84.113006
%U http://arxiv.org/abs/arXiv:1110.1127
%U https://doi.org/10.1103/PhysRevD.84.113006
%P 113006-19pp