The Measurement of alpha(s) from event shapes with the DELPHI detector at the highest LEP energies

Hadronic event shape distributions are determined from data in e+e- collisions between 183 and 207 GeV. From these the strong coupling alpha_s is extracted in O(alpha_s^2), NLLA and matched O(alpha_s^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_Z allows a combined measurement of alpha_s from all DELPHI data and a test of the energy dependence of the strong coupling.

Note:

38 pages, 7 figures, Accepted by Eur. Phys. J. C

electron positron: colliding beams
electron positron: annihilation
quark: pair production
hadron: multiple production
event shape analysis
strong interaction: coupling constant
energy dependence
quantum chromodynamics: perturbation theory
correction: nonperturbative
correction: hadronization

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