Measurements of the strong coupling constant and the QCD color factors using four jet observables from hadronic Z decays
(2002) European Physical Journal C. Particles and Fields — Vol. 27, n° 1, p. 1-17 (2002)
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- et. al.
- Abstract
- Data from e+e- annihilation into hadrons, taken with the ALEPH detector at the Z resonance, are analyzed. The four-jet rate is studied as a function of the resolution parameter and compared to next-to-leading order calculations combined with resummation of large logarithms. Angular correlations in four-jet events are measured and compared to next-to-leading order QCD predictions. With these observables two different measurements are performed. In a first analysis the strong coupling constant is measured from the four-jet rate yielding alpha_s(M_ Z}) = 0.1170 \pm 0.0001(stat) \pm 0.0014(sys) In a second measurement the strong coupling constant and the \textsc{QCD} colour factors are determined simultaneously from a fit to the four-jet rate and the four-jet angular correlations, giving alpha_s(M_ Z) = 0.119 \pm 0.006(stat) \pm 0.026 (sys) C_A = 2.93 \pm 0.14(stat) \pm 0.58 (sys) C_F} = 1.35 \pm 0.07 (stat) \pm 0.26 (sys) in good agreement with the expectation from QCD.
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Delaere, C., Lemaitre, V., van der Aa, O., & et al. (2002). Measurements of the strong coupling constant and the QCD color factors using four jet observables from hadronic Z decays. European Physical Journal C. Particles and Fields, 27(1), 1-17. https://doi.org/10.1140/epjc/s2002-01114-2 (Original work published 2002)