Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-11-09
Phys.Atom.Nucl.65:1319-1340,2002; Yad.Fiz.65:1352-1373,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
53 pages, latex, 4 tables
Scientific paper
10.1134/1.1495645
A numerical value for the running electromagnetic coupling constant in the MS scheme is calculated at the low energy normalization scale equal to the tau-lepton mass M_\tau. This low energy boundary value is used for running the electromagnetic coupling constant to larger scales where high precision experimental measurements can be performed. Particular scales of interest are the b-quark mass for studying the \Upsilon-resonance physics and the Z-boson mass M_Z for high precision tests of the standard model and for the Higgs mass determination from radiative corrections. A numerical value for the running electromagnetic coupling constant at M_Z in the on-shell renormalization scheme is also given.
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