Journal article
A measurement of the QCD colour factor ratios CA/CF and TF/CF from angular correlations in four-jet events
R Akers, G Alexander, J Allison, KJ Anderson, S Arcelli, S Asai, A Astbury, D Axen, G Azuelos, AH Ball, E Barberio, RJ Barlow, R Bartoldus, JR Batley, G Beaudoin, A Beck, GA Beck, J Becker, C Beeston, T Behnke Show all
European Physical Journal C | SPRINGER VERLAG | Published : 1995
DOI: 10.1007/BF01556127
Abstract
From 1 105 045 hadronic Z0 decays observed with the OPAL detector at the LEP e+e- collider, 21 732 four-jet events are selected. A simultaneous fit of three selected angular variables from these events by the second order QCD matrix element calculation yields CA/CF=2.11±0.16(stat.)±0.28(syst.)T F/CF=0.40±0.11(stat.)±0.14(syst.) for the ratios of colour factors, in agreement with SU(3) expectations of CA/CF=9/4 and TF/CF=3/8. © 1995 Springer-Verlag.