Review of alpha-s Measurements

TL;DR

This paper reviews measurements of alpha_s, highlighting current precision limitations mainly due to theoretical uncertainties, and finds consistency across different energy scales with a world average of 0.118.

Contribution

It provides a comprehensive review of alpha_s measurements, emphasizing the current precision and consistency across various experiments and energy scales.

Findings

Measurements are consistent with a world average of 0.118

Current precision limited to 3-20% by theoretical uncertainties

No evidence of discrepancy between low-Q^2 and high-Q^2 results

Abstract

Determinations of alpha_s are reviewed. Current results are limited to a precision of around 3-20%, largely by theoretical uncertainties. All measurements are consistent with a `world average' value of 0.118 +- 0.005 and there is no evodence of any discrepancy between `low-Q^2' and `high-Q^2' results.