Improved alpha_s from Tau Decays
| dc.creator | Malaescu, Bogdan | |
| dc.date | 2008-05-19 | |
| dc.date.accessioned | 2026-07-07T09:39:42Z | |
| dc.date.available | 2026-07-07T09:39:42Z | |
| dc.description | We present an update of the measurement of alpha_s(m_tau) from ALEPH tau hadronic spectral functions. We report a study of the perturbative prediction(s) showing that the fixed-order perturbation theory manifests convergence 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 the most precise one to date, in agreement with the corresponding NNNLO value derived from Z decays. | |
| dc.description | 4pages, 1 figure, Contribution to the proceedings of Moriond 2008, QCD session | |
| dc.identifier | https://arxiv.org/abs/0805.2825 | |
| dc.identifier | http://arxiv.org/abs/0805.2825 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/161267 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Improved alpha_s from Tau Decays | |
| dc.type | text |