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I examine the determination of the QCD color factor ratio CA/CF from thescale evolution of particle multiplicity in e+e- three jet events. I fit ananalytic expression for the multiplicity in three jet events to event samplesgenerated with QCD multihadronic event generators. I demonstrate that a oneparameter fit of CA/CF yields the expected result CA/CF=2.25 in the limit ofasymptotically large energies if energy conservation is included in thecalculation. In contrast, a two parameter fit of CA/CF and a constant offset tothe gluon jet multiplicity, proposed in a recent study, does not yieldCA/CF=2.25 in this limit. I apply the one parameter fit method to recentlypublished data of the DELPHI experiment at LEP and determine the effectivevalue of CA/CF from this technique, at the finite energy of the Z0 boson, to be1.74+-0.03+-0.10, where the first uncertainty is statistical and the second issystematic.Comment: 20 pages including 6 figures Version 2 corrects typographical error  in equation (2

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Determination of the QCD color factor ratio<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>C</mml:mi></mml:mrow><mml:mrow><mml:mi>A</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>/</mml:mo><mml:mi>C</mml:mi></mml:mrow><mml:mrow><mml:mi>F</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>from the scale dependence of multiplicity in three jet events

Determination of the QCD color factor ratioCA/CFfrom the scale dependence of multiplicity in three jet events