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# Determination of the strong coupling constant from the CLEO measurement of the total hadronic cross section in $e^+e^-$ annihilation below 10.56 GeV

Kuhn, Johann H.; Steinhauser, Matthias and Teubner, Thomas (2007) Determination of the strong coupling constant from the CLEO measurement of the total hadronic cross section in $e^+e^-$ annihilation below 10.56 GeV. Physical Review D, 76 . Article Number: 074003. ISSN 1550-2368 (Online); 1550-7998 (Print)

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## Abstract

Using recent CLEO III results for the cross section for $e^+e^- \to {\rm hadrons}$ at seven centre-of-mass energies between 6.964 and 10.538 GeV, we derive a value for the strong coupling constant $\alpha_s(M_Z^2)=0.110_{-0.012}^{-0.010}{}_{-0.011}^{+0.010}$ where the uncertainties are uncorrelated and correlated, respectively. Our result differs significantly from the one derived by CLEO III, as a consequence of inclusion of quark mass effects and the proper matching between the effective theories with four and five flavours. Combining this new result with an analysis based on earlier cross section measurements in the energy region between 2 and 10.6 GeV, we obtain $\alpha_s(M_Z^2)=0.119^{+0.009}_{-0.011}$, well consistent with the current world average.

Item Type: Article LTH 749. arXiv Number: arXiv:0707.2589v1. Additional citation information: PHYSICAL REVIEW D 76, 074003 (2007); 1550-7998/2007/76(7)/074003(3).3 pages Published 3 October 2007. Issue: October 2007. hadrons; center-of-mass; strong coupling quark mass; alphas Q Science > QC Physics Academic Faculties, Institutes and Research Centres > Faculty of Science > Department of Mathematical Sciences 10.1103/PhysRevD.76.074003 ©2007 The American Physical Society http://arxiv.org/abs/0707.2589 Yes Published 358 27 Oct 2008 11:05 20 May 2011 16:57

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