QCD studies in e+e- annihilation from 30 GeV to 189 GeV

Acciarri, M. ; Achard, P. ; Adriani, O. ; Gurtu, A. ; et., al (2000) QCD studies in e+e- annihilation from 30 GeV to 189 GeV Physics Letters B, 489 (1-2). pp. 65-80. ISSN 0370-2693

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0370-2693(00)00891-1


We present results obtained from a study of the structure of hadronic events recorded by the L3 detector at various centre-of-mass energies. The distributions of event shape variables and the energy dependence of their mean values are measured from 30 GeV to 189 GeV and compared with various QCD models. The energy dependence of the moments of event shape variables is used to test a power law ansatz for the non-perturbative component. We obtain a universal value of the non-perturbative parameter α0 = 0.537 ± 0.073. From a comparison with resummed View the MathML source(αs2) QCD calculations, we determine the strong coupling constant at each of the selected energies. The measurements demonstrate the running of αs as expected in QCD with a value of αs(mZ) = 0.1215 ± 0.0012 (exp) ± 0.0061 (th).

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:83405
Deposited On:21 Feb 2012 07:30
Last Modified:21 Feb 2012 07:30

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