Four-jet angular distributions and color charge measurements: leading order versus next-to-leading order

Details Four-jet angular distributions and color charge measurements: leading order versus next-to-leading order Four-jet angular distributions and color charge measurements: leading order versus next-to-leading order

1997-12-15

arxiv.org/abs/hep-ph/9712385v1

Phys.Rev. D57 (1998) 5793-5802

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 10 tables, 5 figures, revtex, eps styles

Scientific paper

10.1103/PhysRevD.57.5793

We present the next-to-leading order perturbative QCD prediction to the four-jet angular distributions used by experimental collaborations at LEP for measuring the QCD color charge factors. We compare our results to ALEPH data corrected to parton level. We perform a leading order ``measurement'' of the QCD color factor ratios by fitting the leading order perturbative predictions to the next-to-leading order result. Our result shows that in an experimental analysis for measuring the color charge factors the use of the O($\alpha_s^3$) QCD predictions instead of the O($\alpha_s^2$) results may shift the center of the fit by a relative factor of $1+2\as$ in the $T_R/C_F$ direction.

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