Using 109000 hadromc events obtained with the ALEPH detector at LEP at energies close to the Z resonance peak. the strong coupling constant ,alphas (MZ 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 kT-clustermg scheme. The analysis uses improved theoretical predictions in whlch leading and next-to-leading logarithms, resummed to all orders, supplement second order expressions. After combining the results from all variables, ,alphas( MZ2) is measured to be 0.125 ± 0 005. where the error is the quadratic sum of experimental and theoretical uncertanties, and is dominated by the latter

Measurement of αs in hadronic Z decays using all-orders resummed predictions / D. Decamp, B. Deschizeaux, C. Goy, J.-P. Lees, M.-N. Minard, R. Alemany, F. Ariztizabal, P. Comas, J.M. Crespo, M. Delfino, E. Fernandez, V. Gaitan, Ll. Garrido, Ll.M. Mir, A. Pacheco, A. Pascual, D. Creanza, M. de Palma, A. Farilla, G. Iaselli, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 284:(1992), pp. 163-176. [10.1016/0370-2693(92)91942-3]

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

FOCARDI, ETTORE;
1992

Abstract

Using 109000 hadromc events obtained with the ALEPH detector at LEP at energies close to the Z resonance peak. the strong coupling constant ,alphas (MZ 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 kT-clustermg scheme. The analysis uses improved theoretical predictions in whlch leading and next-to-leading logarithms, resummed to all orders, supplement second order expressions. After combining the results from all variables, ,alphas( MZ2) is measured to be 0.125 ± 0 005. where the error is the quadratic sum of experimental and theoretical uncertanties, and is dominated by the latter
1992
284
163
176
D. Decamp;B. Deschizeaux;C. Goy;J.-P. Lees;M.-N. Minard;R. Alemany;F. Ariztizabal;P. Comas;J.M. Crespo;M. Delfino;E. Fernandez;V. Gaitan;L...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/638289
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