TL;DR
This paper reviews various measurements of the strong coupling constant alpha_S, discusses their methods, computes intermediate averages, and presents a final world average value, emphasizing recent lattice QCD results.
Contribution
It provides a comprehensive synthesis of alpha_S measurements, including a consistent treatment of correlations and an updated world average based on recent data.
Findings
Final world average alpha_S(M_Z) = 0.1175 +/- 0.0011
Recent lattice QCD results dominate the average
Intermediate averages help combine different measurement classes
Abstract
We present a review of measurements of alpha_S. The individual measurements are discussed and intermediate averages for classes of related measurements are found. The final average is built using the intermediate values. Correlations are treated consistently. The ICHEP 2006 world average is alpha_S(M_Z) = 0.1175 +/- 0.0011 dominated by the recent result from lattice QCD.
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