TL;DR
This paper reviews precise measurements of the strong coupling constant alpha_s at HERA, demonstrating its energy-scale dependence and confirming QCD predictions with an average alpha_s(Mz) value.
Contribution
It provides a comprehensive review of HERA measurements of alpha_s, including a combined analysis showing the running of the coupling consistent with QCD.
Findings
Measured alpha_s(Mz) = 0.1186 with uncertainties.
Confirmed the energy-scale dependence of alpha_s.
Results agree with QCD predictions.
Abstract
The precision measurements of the strong coupling constant, alphas, and its energy-scale dependence carried out at HERA by the H1 and ZEUS Collaborations are reviewed. An average value of alphas(Mz) = 0.1186 +- 0.0011 (exp.) +- 0.0050 (th.) is obtained from these measurements. The combined HERA determinations of the energy-scale dependence of alphas clearly show the running of alphas from jet data alone and are in agreement with the running of the coupling as predicted by QCD.
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