TL;DR
This paper reports precise measurements of the strong coupling constant alpha_s at HERA, demonstrating its energy-scale dependence and confirming QCD predictions through jet cross-section data.
Contribution
First combined determination of alpha_s(Mz) from HERA jet data, showing the running of the coupling consistent with QCD.
Findings
Alpha_s(Mz) = 0.1198 ± 0.0019 (exp.) ± 0.0026 (th.)
Clear evidence of the running of alpha_s with energy scale
Results agree with QCD predictions
Abstract
Recent determinations of alphas(Mz) from the H1 and ZEUS Collaborations using inclusive-jet cross-section measurements in neutral current deep inelastic scattering at high Q2 are presented. A combined value of alphas(mz)=0.1198 +- 0.0019 (exp.) +- 0.0026 (th.) was obtained from these measurements. The determinations of alphas at various scales clearly show the running of the coupling from HERA jet data alone and in agreement with the prediction of QCD.
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