αs(MZ2)from hadronicτdecays

2008/07/31 by K. Maltman, Kim Maltman, Tzahi Yavin +1
Physics and Astronomy · #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1103/physrevd.78.094020

published as Phys.Rev.D78:094020,2008 · 30 pages, 3 figures. Published version. Minor rearrangements and subdivision of longer sections into subsections for ease of reading

openalex publication_date 2008/11/20 · arxiv created 2009/06/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We perform an extraction of \ensuremathα_s based on sum rules involving isovector hadronic \ensuremathτ decay data. The particular sum rules employed are constructed specifically to suppress contributions associated with poorly known higher dimension condensates, and hence reduce theoretical systematic uncertainties associated with the treatment of such contributions which are shown to be present in earlier related analyses. Running our results from the n_f=3 to n_f=5 regime we find \ensuremathα_s(M_Z²)=0.1187\ifmmode±\else\textpm\fi0.0016, in excellent agreement with the recently updated global fit to electroweak data at the Z scale and other high-scale direct determinations.

Citations

• Study of τ−→KSπ−ντ decay at Belle
• Review of Particle Physics
• Heavy quark masses from sum rules in four-loop approximation
• Contour-improved versus fixed-order perturbation theory in hadronic τ decays
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• Review of Particle Physics