TY  - JOUR
AU  - Boito, D.
AU  - Cata, O.
AU  - Golterman, M.
AU  - Jamin, M.
AU  - Maltman, K.
AU  - Osborne, J.
AU  - Peris, S.
PY  - 2011
DA  - 2011//
TI  - New determination of alpha(s) from hadronic tau decays
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 113006
EP  - 19pp
VL  - 84
IS  - 11
PB  - Amer Physical Soc
AB  - 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).
SN  - 1550-7998
UR  - http://arxiv.org/abs/arXiv:1110.1127
UR  - https://doi.org/10.1103/PhysRevD.84.113006
DO  - 10.1103/PhysRevD.84.113006
LA  - English
N1  - WOS:000298131000001
ID  - Boito_etal2011
ER  -