Hadronic vacuum polarization effects in alpha_{em}(M_Z)
High Energy Physics - Phenomenology
2007-05-23 v1
Abstract
Recent evaluations of the hadronic vacuum polarization contributions to the effective fine-structure constant alpha_{em}(M_Z) are summarized and commented. A new update based on corrected CMD-2 data is presented. My new estimates are Delta alpha_{had}^{(5)}(M_Z) = 0.027773 +/- 0.000354 (e^+e^- - data based) and Delta alpha_{had}^{(5)}(M_Z) = 0.027664 +/- 0.000173 (via the Adler-function and extended use of pQCD). Prospects of further possible progress is discussed.
Cite
@article{arxiv.hep-ph/0308117,
title = {Hadronic vacuum polarization effects in alpha_{em}(M_Z)},
author = {F. Jegerlehner},
journal= {arXiv preprint arXiv:hep-ph/0308117},
year = {2007}
}
Comments
16 pages, Latex, 3 figures, 2 tables