ISSN:
1434-6052
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract 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 $$C_A /C_F = 2.12 \pm 0.35 and N_C /N_A = 0.46 \pm 0.19,$$ 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01498617
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