Measurement of the strong coupling constant alpha-s from global event shape variables of hadronic Z decays

Decamp, D. and Finch, Alexander (1991) Measurement of the strong coupling constant alpha-s from global event shape variables of hadronic Z decays. Physics Letters B, 255 (4). pp. 623-633. ISSN 0370-2693

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Abstract

An analysis of global event-shape variables has been carried out for the reaction e+e−→Z0→hadrons to measure the strong coupling constant αs. This study is based on 52 720 hadronic events obtained in 1989/90 with the ALEPH detector at the LEP collider at energies near the peak of the Z-resonance. In order to determine αs, second order QCD predictions modified by effects of perturbative higher orders and hadronization were fitted to the experimental distributions of event-shape variables. From a detailed analysis of the theoretical uncertainties we find that this approach is best justified for the differential two-jet rate, from which we obtain αs(MZ2) = 0.121 ± 0.002(stat.)±0.003(sys.)±0.007(theor.) using a renormalization scale . The dependence of αs(MZ2) on ω is parameterized. For scales mb<ω<MZ the result varies by −0.012+0.007.

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters B
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
63802
Deposited By:
Deposited On:
07 May 2013 13:49
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 08:25