The strong coupling from the revised ALEPH data for hadronic $\tau$ decays

Abstract

We apply an analysis method previously developed for the extraction of the strong coupling from the OPAL data to the recently revised ALEPH data for non-strange hadronic $\tau$ decays. Our analysis yields the values ${\alpha }_s(m_{\tau }^2)=0.296\pm 0.010$ using fixed-order perturbation theory, and ${\alpha }_s(m_{\tau }^2)=0.310\pm 0.014$ using contour-improved perturbation theory. Averaging these values with our previously obtained values from the OPAL data, we find ${\alpha }_s(m_{\tau }^2)=0.303\pm 0.009$, respectively, ${\alpha }_s(m_{\tau }^2)=0.319\pm 0.012$. We present a critique of the analysis method employed previously, for example in analyses by the ALEPH and OPAL collaborations, and compare it with our own approach. Our conclusion is that non-perturbative effects limit the accuracy with which the strong coupling, an inherently perturbative quantity, can be extracted at energies as low as the $\tau$ mass. Our results further indicate that systematic errors on the determination of the strong coupling from analyses of hadronic $\tau$-decay data have been underestimated in much of the existing literature.

41 pages, 15 figures, version published in Phys. Rev. D

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