Experimental Study of the Triple-Gluon Vertex

Experimental Study of the Triple-Gluon Vertex

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Experimental Study of the Triple-Gluon Vertex

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DELPHI Collaboration; Allen, Paul; Alted Abad, Francesc Josep; Benlloch Baviera, José María; Castillo Giménez, María Victoria Perfil; Contreras González, José Luis; Ferrer Soria, Antonio Perfil; Fuster Verdú, Juan A. Perfil; Fez Laso, M. D. M. de; Gómez Cadenas, Juan José Perfil; Hernández Rey, Juan José Perfil; Higón Rodríguez, Emilio Perfil; Lozano Bahilo, José Julio; Llosá Reig, Rafael; Sánchez Rojo, María Ester; Sánchez Martínez, Javier; Valls Ferrer, Juan Antonio; Velasco González, Jorge; Zúñiga Román, Juan
This document is a artículoDate1991

Este documento está disponible también en : http://hdl.handle.net/10550/53683
In four-jet events from e + e − →Z 0 →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 N c to the fermionic Casimir operator C F : N c C F = 2.55 ± 0.55 ( stat. ) ± 0.4 ( fragm. + models ) ± 0.2 ( error in bias ) in agreement with the value 2.25 expected in QCD from N c =3 and C F = 4 3 .

    DELPHI Collaboration Allen, Paul Alted Abad, Francesc Josep Benlloch Baviera, José María Castillo Giménez, María Victoria Contreras González, José Luis Ferrer Soria, Antonio Fuster Verdú, Juan A. Fez Laso, M. D. M. de Gómez Cadenas, Juan José Hernández Rey, Juan José Higón Rodríguez, Emilio Lozano Bahilo, José Julio Llosá Reig, Rafael Sánchez Rojo, María Ester Sánchez Martínez, Javier Valls Ferrer, Juan Antonio Velasco González, Jorge Zúñiga Román, Juan 1991 Experimental Study of the Triple-Gluon Vertex Physics Letters B 255 3 466 476

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