Alpha_s Determination from Tau Decays: Theoretical Status
High Energy Physics - Phenomenology
2010-11-02 v1
Abstract
The total tau hadronic width can be accurately calculated using analyticity and the operator product expansion. The result turns out to be very sensitive to the value of alpha_s(m_tau^2), providing a precise determination of the strong coupling constant. The theoretical description of this observable is updated, including the recently computed O(alpha_s^4) contributions. The experimental determination of alpha_s(m_tau^2) and its actual uncertainties are discussed.
Keywords
Cite
@article{arxiv.1001.0389,
title = {Alpha_s Determination from Tau Decays: Theoretical Status},
author = {Antonio Pich},
journal= {arXiv preprint arXiv:1001.0389},
year = {2010}
}
Comments
Invited talk at the Flavianet topical workshop on "Low energy constraints on extensions of the Standard Model", Kazimierz, Poland, 23-27 July 2009