TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhysProc.1.035
TI  - The strong coupling from $e^+e^-\to$~hadrons
PY  - 2019/02/21
UR  - https://scipost.org/SciPostPhysProc.1.035
JF  - SciPost Physics Proceedings
JA  - SciPost Phys. Proc.
VL  - 
IS  - 1
SP  - 035
A1  - Boito, Diogo
AU  - Golterman, Maarten
AU  - Keshavarzi, Alex
AU  - Maltman, Kim
AU  - Nomura, Daiskuke
AU  - Peris, Santiago
AU  - Teubner, Thomas
AB  - We use a new compilation of the hadronic $R$-ratio from available data for the process $e^+e^-\to$ hadrons below the charm mass to determine the strong coupling $\alpha_s$, using finite-energy sum rules. Quoting our results at the $\tau$ mass to facilitate comparison to the results obtained from similar analyses of hadronic $\tau$-decay data, we find $\alpha_s(m_\tau^2)=0.298\pm 0.016\pm 0.006$ in fixed-order perturbation theory, and $\alpha_s(m_\tau^2)=0.304\pm 0.018\pm 0.006$ 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 $\tau$ decays. We briefly compare the $R(s)$-based analysis with the $\tau$-based analysis.
ER  -

@Article{10.21468/SciPostPhysProc.1.035,
	title={{The strong coupling from $e^+e^-\to$~hadrons}},
	author={Diogo Boito and Maarten Golterman and Alex Keshavarzi and Kim Maltman and Daiskuke Nomura and Santiago Peris and Thomas Teubner},
	journal={SciPost Phys. Proc.},
	pages={035},
	year={2019},
	publisher={SciPost},
	doi={10.21468/SciPostPhysProc.1.035},
	url={https://scipost.org/10.21468/SciPostPhysProc.1.035},
}