1212.0091 (Diogo Boito et al.)

The strong coupling from tau decays without prejudice    [PDF]

Diogo Boito, Maarten Golterman, Matthias Jamin, Andisheh Mahdavi, Kim Maltman, James Osborne, Santiago Peris

We review our recent determination of the strong coupling \alpha_s from the OPAL data for non-strange hadronic tau decays. We find that \alpha_s(m^2_\tau) =0.325+-0.018 using fixed-order perturbation theory, and \alpha_s(m^2_\tau)=0.347+-0.025 using contour-improved perturbation theory. At present, these values supersede any earlier determinations of the strong coupling from hadronic tau decays, including those from ALEPH data.

View original: http://arxiv.org/abs/1212.0091