Measurement of the triple gluon vertex from four - jet events at LEP

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1993) Zeitschrift für Physik. C, Particles and fields — Vol. 59, n° 3, p. 357-368 (1993)

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From the combined data of 1990 and 1991 of the DELPHI experiment at LEP, 13057 4-jet events are obtained and used for determining the contribution of the triple-gluon vertex. The relevant variables are the generalized Nachtmann Reiter angle θ NR * and the opening angle of the two least energetic jets. A fit to their two-dimensional distribution yields CA/CF=2.12±0.35andNC/NA=0.46±0.19, whereC A/C F is the ratio of the coupling strength of the triple-gluon vertex to that of gluon bremsstrahlung from quarks, andN C/N A, the ratio of the number of quark colours to the number of gluons. This constitutes a convincing model-independent proof of the existence of the triple-gluon vertex, since its contribution is directly proportional toC A/C F. The results are in agreement with the values expected from QCD:C A/C F=2.25, andN C/N A=3/8.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1993). Measurement of the triple gluon vertex from four - jet events at LEP. Zeitschrift für Physik. C, Particles and fields, 59(3), 357-368. https://doi.org/10.1007/BF01498617 (Original work published 1993)