Running electromagnetic coupling constant: low energy normalization and the value at M_Z
High Energy Physics - Phenomenology
2011-01-27 v1
Abstract
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.
Cite
@article{arxiv.hep-ph/0011135,
title = {Running electromagnetic coupling constant: low energy normalization and the value at M_Z},
author = {A. A. Pivovarov},
journal= {arXiv preprint arXiv:hep-ph/0011135},
year = {2011}
}
Comments
53 pages, latex, 4 tables