Infrared and collinear safe event shape distributions and their mean values are determined using the data taken at five different centre of mass energies above M-Z with the DELPHI detector at LEP. From the event shapes, the strong coupling alpha(s) is extracted in O(alpha(s)(2)), NLLA and a combined scheme using hadronisation corrections evaluated with fragmentation model generators as well as using an analytical power ansatz. Comparing these measurements to those obtained at M-Z, the energy dependence (running) of alpha(s) is accessible. The logarithmic energy slope of the inverse strong coupling is measured to be d alpha(s)(-1)/d log(E-cm) = 1.39 +/- 0.34 (stat) +/- 0.17(syst), in good agreement with the QCD expectation of 1.27. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

Energy dependence of event shapes and of alpha(s) at LEP 2

AMAPANE, Nicola Carlo;MIGLIORE, Ernesto;ROMERO, Alessandra;
1999-01-01

Abstract

Infrared and collinear safe event shape distributions and their mean values are determined using the data taken at five different centre of mass energies above M-Z with the DELPHI detector at LEP. From the event shapes, the strong coupling alpha(s) is extracted in O(alpha(s)(2)), NLLA and a combined scheme using hadronisation corrections evaluated with fragmentation model generators as well as using an analytical power ansatz. Comparing these measurements to those obtained at M-Z, the energy dependence (running) of alpha(s) is accessible. The logarithmic energy slope of the inverse strong coupling is measured to be d alpha(s)(-1)/d log(E-cm) = 1.39 +/- 0.34 (stat) +/- 0.17(syst), in good agreement with the QCD expectation of 1.27. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
1999
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P. Abreu;W. Adam;T. Adye;P. Adzic;Z. Albrecht;T. Alderweireld;G. D. Alekseev;R. Alemany;T. Allmendinger;P. P. Allport;S. Almehed;U. Amaldi;N. Amapane;S. Amato;E. G. Anassontzis;P. Andersson;A. Andreazza;S. Andringa;P. Antilogus;W. D. Apel;Y. Arnoud;B. Asman;J. E. Augustin;A. Augustinus;P. Baillon;P. Bambade;F. Barao;G. Barbiellini;R. Barbier;D. Y. Bardin;G. Barker;A. Baroncelli;M. Battaglia;M. Baubillier;K. H. Becks;M. Begalli;A. Behrmann;P. Beilliere;Y. Belokopytov;K. Belous;N. C. Benekos;A. C. Benvenuti;C. Berat;M. Berggren;D. Bertini;D. Bertrand;M. Besancon;F. Bianchi;M. Bigi;M. S. Bilenky;M. A. Bizouard;D. Bloch;H. M. Blom;M. Bonesini;W. Bonivento;M. Boonekamp;P. S. L.;A. W. Borgland;C. Borisov;C. Bosio;O. Botner;E. Boudinov;B. Bouquet;C. Bourdarios;T. J. V.;I. Boyko;I. Bozovic;M. Bozzo;P. Branchini;T. Brenke;R. A. Brenner;P. Bruckman;J. M. Brunet;L. Bugge;T. Buran;T. Burgsmueller;B. Buschbeck;P. Buschmann;S. Cabrera;M. Caccia;M. Calvi;T. Camporesi;V. Canale;F. Carena;L. 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