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Experimental study of the triple-gluon vertex

1991

Abstract In four-jet events from e+e− →Z0 →multihadrons one can separate the three principal contributions from the triple-gluon vertex, double gluon-bremsstrahlung and the secondary quark-antiquark production, using the shape of the two-dimensional angular distributions in the generalized Nachtmann-Reiter angle θ NR ∗ and the opening angle of the secondary jets. Thus one can identify directly the contribution from the triple-gluon vertex without comparison with a specific non-QCD model. Applying this new method to events taken with the DELPHI-detector we get for the ratio of the colour factor Nc to the fermionic Casimir operator C F : N c C F = 2.55 ± 0.55 ( stat. ) ± 0.4 ( fragm. + models…

Particle physicsCOLLISIONSNuclear and High Energy PhysicsE+E ANNIHILATION[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]LUND MONTE-CARLOElectron–positron annihilationHigh Energy Physics::LatticeNON-ABELIAN NATURE01 natural sciencesJET FRAGMENTATIONDECAYSPHYSICSAngular distribution3-GLUON VERTEX0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physicsQuantum chromodynamicsPhysics010308 nuclear & particles physicsLUND MONTE-CARLO; NON-ABELIAN NATURE; 4-JET EVENTS; JET FRAGMENTATION; E+E ANNIHILATION; 3-GLUON VERTEX; QCD; PHYSICS; COLLISIONS; DECAYSHigh Energy Physics::PhenomenologyCasimir elementQCDVertex (geometry)Gluon4-JET EVENTSFísica nuclearHigh Energy Physics::ExperimentParticle Physics - Experiment
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