Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1999-11-09
Phys.Rev. D61 (2000) 114007
Physics
High Energy Physics
High Energy Physics - Experiment
20 pages including 6 figures Version 2 corrects typographical error in equation (2)
Scientific paper
10.1103/PhysRevD.61.114007
I examine the determination of the QCD color factor ratio CA/CF from the scale evolution of particle multiplicity in e+e- three jet events. I fit an analytic expression for the multiplicity in three jet events to event samples generated with QCD multihadronic event generators. I demonstrate that a one parameter fit of CA/CF yields the expected result CA/CF=2.25 in the limit of asymptotically large energies if energy conservation is included in the calculation. In contrast, a two parameter fit of CA/CF and a constant offset to the gluon jet multiplicity, proposed in a recent study, does not yield CA/CF=2.25 in this limit. I apply the one parameter fit method to recently published data of the DELPHI experiment at LEP and determine the effective value of CA/CF from this technique, at the finite energy of the Z0 boson, to be 1.74+-0.03+-0.10, where the first uncertainty is statistical and the second is systematic.
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