Journal article

Measurement of event shape distributions and moments in e e-→hadrons at 91-209 GeV and a determination of αs

G Abbiendi, C Ainsley, PF Åkesson, G Alexander, J Allison, P Amaral, G Anagnostou, KJ Anderson, S Asai, D Axen, I Bailey, E Barberio, T Barillari, RJ Barlow, RJ Batley, P Bechtle, T Behnke, KW Bell, PJ Bell, G Bella Show all

EUROPEAN PHYSICAL JOURNAL C | SPRINGER | Published : 2005

Abstract

Abstract.We have studied hadronic events from e + e- annihilation data at centre-of-mass energies from 91 to 209 GeV. We present distributions of event shape observables and their moments at each energy and compare with QCD Monte Carlo models. From the event shape distributions we extract the strong coupling $$\ensuremath{\alpha_{\mathrm{s}}}$$ and test its evolution with energy scale. The results are consistent with the running of $$\ensuremath{\alpha_{\mathrm{s}}}$$ expected from QCD. Combining all data, the value of $$\ensuremath{\alpha_{\mathrm{s}}} \ensuremath{(M_{\mathrm{Z}})}$$ is determined to be $$ \ensuremath{\alpha_{\mathrm{s..

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