Using 109 000 hadronic events obtained with the ALEPH detector at LEP at energies close to the Z resonance peak, the strong coupling constant alpha(s) (M(Z)2) is determined from an analysis of the global event shape variables thrust, heavy jet mass and the differential two-jet rate based on the k(T)-clustering scheme. The analysis uses improved theoretical predictions in which leading and next-to-leading logarithms, resummed to all orders, supplement second order expressions. After combining the results from all variables, alpha(s) (M(Z)2) is measured to be 0. 12 5 +/- 0.005, where the error is the quadratic sum of experimental and theoretical uncertainties, and is dominated by the latter.

Measurement of αs in hadronic Z decays using all-orders resummed predictions

Creanza, D.;Iaselli, G.;Maggi, G.;
1992-01-01

Abstract

Using 109 000 hadronic events obtained with the ALEPH detector at LEP at energies close to the Z resonance peak, the strong coupling constant alpha(s) (M(Z)2) is determined from an analysis of the global event shape variables thrust, heavy jet mass and the differential two-jet rate based on the k(T)-clustering scheme. The analysis uses improved theoretical predictions in which leading and next-to-leading logarithms, resummed to all orders, supplement second order expressions. After combining the results from all variables, alpha(s) (M(Z)2) is measured to be 0. 12 5 +/- 0.005, where the error is the quadratic sum of experimental and theoretical uncertainties, and is dominated by the latter.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/3409
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