# Differences

This shows you the differences between two versions of the page.

 — preprints:1997:ttp97-26 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== TTP97-26 $\alpha_s(m_Z)$ from tau decays with matching conditions at three loops  ====== + + + Using the recent four-loop calculations of the QCD beta-function and + the three-loop matching coefficients we study the induced error in + $\alpha_s(m_Z)$ obtained from $\alpha_s(m_tau)$ due to the evolution + procedure. We show that, when consistent matching and running is used + at this order, these errors are pushed below 0.0005 in $\alpha_s(m_Z)$. + + + |**German Rodrigo (Karlsruhe U.), Antonio Pich, Arcadi Santamaria (Valencia U.)**  | + |** Phys. Lett. B 424 367-374 1998  **  | + | {{preprints:1997:ttp97-26.pdf|PDF}} {{preprints:1997:ttp97-26.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9707474|arXiv]]   | + | |