New Evaluation of the QED Running Coupling and of the Muonium Hyperfine Splitting

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dc.creatorNarison, Stephan
dc.date2001-08-07
dc.date2001-10-26
dc.date.accessioned2026-07-07T03:45:06Z
dc.date.available2026-07-07T03:45:06Z
dc.descriptionWe present a new independent evaluation of the hadronic and QCD contributions to the QED running coupling α(M_Z) and to the muonium hyperfine splitting ν. We obtain: Δα_{had}=2770(17)10^{-5} and Δν_{had}=232.5(2.5) Hz. Combined with the QED and Electroweak Standard Model contributions, they lead to: α^{-1}(M_Z)=128.926(25) and to the Fermi energy splitting ν_F=4~459~031~783(229) Hz, where for the latter, we have used, in addition, the precise measurement of the muonium hyperfine splitting ν_{exp}. We use ν_F in order to predict the ratios of masses m_μ/m_e=206.768~276(11) and of the magnetic moments μ_μ/μ^e_B=4.841~970~47(25)10^{-3}, which are in excellent agreement with the ones quoted by the Particle Data Group. These remarkable agreements can provide strong constraints on some contributions beyond the Standard Model.
dc.descriptionSome corrections and explanations added. 6 pages (latex file), 2 tables, 1 figure
dc.identifierhttps://arxiv.org/abs/hep-ph/0108065
dc.identifierhttp://arxiv.org/abs/hep-ph/0108065
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/40818
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Theory
dc.titleNew Evaluation of the QED Running Coupling and of the Muonium Hyperfine Splitting
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