Measurement of alpha_s(M_Z^2) from Hadronic Event Observables at the Z^0 Resonance

Details Measurement of alpha_s(M_Z^2) from Hadronic Event Observables at the Z^0 Resonance Measurement of alpha_s(M_Z^2) from Hadronic Event Observables at the Z^0 Resonance

1995-01-06

arxiv.org/abs/hep-ex/9501003v3

Phys.Rev.D51:962-984,1995

Physics

High Energy Physics

High Energy Physics - Experiment

46 pages, latex, 38 figures in EPS format

Scientific paper

10.1103/PhysRevD.51.962

The strong coupling alpha_s(M_Z^2) has been measured using hadronic decays of Z^0 bosons collected by the SLD experiment at SLAC. The data were compared with QCD predictions both at fixed order, O(alpha_s^2), and including resummed analytic formulae based on the next-to-leading logarithm approximation. In this comprehensive analysis we studied event shapes, jet rates, particle correlations, and angular energy flow, and checked the consistency between alpha_s(M_Z^2) values extracted from these different measures. Combining all results we obtain alpha_s(M_Z^2) = 0.1200 \pm 0.0025(exp.) \pm 0.0078(theor.), where the dominant uncertainty is from uncalculated higher order contributions.

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