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

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Abreu, P. [--] Cortina Gil, Eduardo [UCL] DELPHI Collaboration [--]

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 αs is extracted in View the MathML source(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 αs is accessible. The logarithmic energy slope of the inverse strong coupling is measured to be View the MathML source in good agreement with the QCD expectation of 1.27.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 1999
Language Anglais
Journal information "Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics" - Vol. 456, no.2-4, p. 322-340 (1999)
Peer reviewed yes
Publisher Elsevier BV * North-Holland ((Netherlands) Amsterdam)
issn 0370-2693
e-issn 1873-2445
Publication status Publié
Affiliation UCL - SST/IRMP - Institut de recherche en mathématique et physique
Links
Bibliographic reference Abreu, P. ; Cortina Gil, Eduardo ; DELPHI Collaboration ; et. al. Energy dependence of event shapes and of alpha(s) at LEP-2 . In: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 456, no.2-4, p. 322-340 (1999)
Permanent URL http://hdl.handle.net/2078.1/123045