Precise alpha_s from Tau Decays

Details Precise alpha_s from Tau Decays Precise alpha_s from Tau Decays

2008-09-16

arxiv.org/abs/0809.2823v2

Nucl.Phys.Proc.Suppl.186:183-186,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures. To appear in the proceedings of QCD08, Montpellier, France, 7-12th July 2008

Scientific paper

10.1016/j.nuclphysbps.2008.12.04

An updated measurement of alpha_s(m_tau) from ALEPH tau hadronic spectral functions is presented. We report a study of the perturbative prediction(s) showing that the fixed-order perturbation theory manifests convergence or principle problems not presented in the contour-improved calculation. Potential systematic effects from quark-hadron duality violations are estimated to be within the quoted systematic errors. The fit result is alpha_s(m_tau) = 0.344 +- 0.005 +- 0.007, where the first error is experimental and the second theoretical. After evolution, the alpha_s(M_Z) determined from tau data is one of the most precise to date, in agreement with the corresponding NNNLO value derived from Z decays.

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