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 MZ with the DELPHI detector at LEP. From the event shapes, the strong coupling alphaS is extracted in θ(αS2), 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 MZ, the energy dependence (running) of alphaS is accessible. The logarithmic energy slope of the inverse strong coupling is measured to be d αS-1/d log (Ecm) = 1.39 + 0.34(stat) + 0.17(syst), in good agreement with the QCD expectation of 1.27. © 1999 Published by Elsevier Science B.V. All rights reserved.

Abreu, P., Adam, W., Adye, T., Adzic, P., Albrecht, Z., Alderweireld, T., et al. (1999). Energy dependence of event shapes and of alpha_s at LEP 2. PHYSICS LETTERS. SECTION B, 456(2-4), 322-340.

Energy dependence of event shapes and of alpha_s at LEP 2

Calvi, M.;Paganoni, M.;Ragazzi, S.;Tabarelli, T.;Terranova, F.;
1999

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 MZ with the DELPHI detector at LEP. From the event shapes, the strong coupling alphaS is extracted in θ(αS2), 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 MZ, the energy dependence (running) of alphaS is accessible. The logarithmic energy slope of the inverse strong coupling is measured to be d αS-1/d log (Ecm) = 1.39 + 0.34(stat) + 0.17(syst), in good agreement with the QCD expectation of 1.27. © 1999 Published by Elsevier Science B.V. All rights reserved.
Articolo in rivista - Articolo scientifico
Nuclear and High Energy Physics
English
1999
456
2-4
322
340
none
Abreu, P., Adam, W., Adye, T., Adzic, P., Albrecht, Z., Alderweireld, T., et al. (1999). Energy dependence of event shapes and of alpha_s at LEP 2. PHYSICS LETTERS. SECTION B, 456(2-4), 322-340.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/187510
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