Alpha_s from hadronic tau decay data
Abstract
We discuss the extraction of alpha_s using isovector hadronic tau decay data and sum rules constructed specifically to suppress contributions associated with poorly known higher dimension condensates. We show, first, that problems with the treatment of such contributions affect earlier related analyses and, second, that these problems can be brought under good theoretical control through the use of an alternate analysis strategy. Our results, run up to the n_f=5 regime, correspond to alpha_s(M_Z^2)=0.1187(16), in excellent agreement with the recently updated global fit to electroweak data at the Z scale and other high-scale direct determinations.
Keywords
Cite
@article{arxiv.0812.2457,
title = {Alpha_s from hadronic tau decay data},
author = {Kim Maltman and Tzahi Yavin},
journal= {arXiv preprint arXiv:0812.2457},
year = {2015}
}
Comments
6 pages, 1 figure. Talk given at the 10th International Workshop on Tau Lepton Physics, Novosibirsk, Russia, Sep. 22-25, 2008