Improving alpha_QED(M_Z^2) and the charm mass by analytic continuation

Details Improving alpha_QED(M_Z^2) and the charm mass by analytic continuation Improving alpha_QED(M_Z^2) and the charm mass by analytic continuation

2000-12-18

arxiv.org/abs/hep-ph/0012231v2

Eur.Phys.J.C19:681-691,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 23 pages, 7 eps figures, typos removed, accepted by Eur. Phys. J. C

Scientific paper

10.1007/s100520100598

The standard determination of the QED coupling on the Z pole is performed using the latest available data for R. The direct application of analytic continuation techniques is found not to improve the accuracy of the value of \alpha(M_Z^2). However they help to resolve an ambiguity in the values of R in the energy region \sqrt{s} < 2 GeV, which, in turn, reduces the uncertainty in \alpha(M_Z^2). Moreover, they provide a sensitive determination of the mass of the charm quark. The favoured solution, which uses the inclusive data for R for \sqrt{s} < 2 GeV, has a pole mass m_c = 1.33-1.40 GeV and \alpha^{-1}(M_Z^2) = 128.972 +/- 0.026; whereas if the sum of the exclusive channels is used to determine R in this region, we find \alpha^{-1}(M_Z^2) = 128.941 +/- 0.029.

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