The measurement of ... from event shapes with the DELPHI detector at the highest LEP energies.

Authors :: Abdallah, J.
Abreu, P.
Adam, W.
Adzic, P.
Albrecht, I.
Alderweireld, T.
Alemany-Fernandez, R.
Allmendinger, T.
Allport, P.
Amaldi, U.
Amapane, N.
Amato, S.
Anashkin, E.
Andreazza, A.
Andringa, S.
Anjos, N.
Antilogus, P.
Apel, W-D.
Arnoud, Y.
Ask, S.
Source :: European Physical Journal C -- Particles & Fields; Sep2004, Vol. 37 Issue 1, p1-23, 23p
Publication Year :: 2004
Abstract: Hadronic event shape distributions are determined from data in e<superscript>+</superscript>e<superscript>-</superscript> collisions between 183 and 207 GeV. From these the strong coupling α<subscript>3</subscript> is extracted in O(α<subscript>s</subscript>²), NLLA and matched O(α<subscript>s</subscript>²)+NLLA theory. Hadronisation corrections evaluated with fragmentation model generators as well as an analytical power ansatz are applied. Comparing these measurements to those obtained at and around M<subscript>z</subscript> allows a combined measurement of α<subscript>s</subscript> from all DELPHI data and a test of the energy dependence of the strong coupling. [ABSTRACT FROM AUTHOR]

Subjects :: HADRONS
PARTICLES (Nuclear physics)
PARTONS
COUPLING constants
NUCLEAR physics
ELECTRIC generators

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