2018/11/05 by Diogo Boito, Boito, Diogo, Maarten Golterman +11
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.1811.01829
11 pages, contribution to the International Workshop on Tau Lepton Physics, 2018
arxiv created 2018/11/05 · arxiv updated 2018/11/06
We use a new compilation of the hadronic R-ratio from available data for the process e+e-→ hadrons below the charm mass to determine the strong coupling αs, using finite-energy sum rules. Quoting our results at the τ mass to facilitate comparison to the results obtained from similar analyses of hadronic τ-decay data, we find αs(mτ2)=0.298± 0.016± 0.006 in fixed-order perturbation theory, and αs(mτ2)=0.304± 0.018± 0.006 in contour-improved perturbation theory, where the first error is statistical, and the second error combines various systematic effects. These values are in good agreement with a recent determination from the OPAL and ALEPH data for hadronic τ decays. We briefly compare the R(s)-based analysis with the τ-based analysis.