PoS - Proceedings of Science
Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - QCD and Hadronic Physics
The strong coupling from $e^+e^-$ → hadrons below charm threshold
D. Boito,* M. Golterman, A. Keshavarzi, K. Maltman, D. Nomura, S. Peris, T. Teubner
*corresponding author
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Pre-published on: June 10, 2020
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We present our recent results on the extraction of the strong coupling, $\alpha_s$, from a new compilation of the hadronic $R$-ratio obtained from the available data for $e^+e^- \to {\rm hadrons}$. The determination uses all data up to $s=4$~GeV$^2$, where $s$ is the square of the center-of-mass energy. We obtain competitive values with only a small contamination from non-perturbative effects and with smaller theoretical uncertainties than the extractions from hadronic $\tau$ decays.
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