Evidence for the triple-gluon vertex from measurements of the QCD colour factors in Z decay into four jets

J P Schuller,J Schwindling,D Si Mohand,B Vallage,R P Johnson,A M Litke,J A Wear,J G Ashman,W Babbage,C N Booth,C M Buttar,R E Carney,S Cartwright,F Combley,F Hatfield, Juan Carlos De Martin,David G Parker,Peter R Reeves,L F Thompson,E Barberio,S Brandt,C Grupen,L Mirabito,U Schafer,H Seywerd,G Ganis,G Giannini,B Gobbo,F Ragusa,L Bellantoni,D Cinabro,J Conway,D F Cowen, Zhe Feng,D Ferguson,Y S Gao,J Grahl,J L Harton,R C Jared,B W Leclaire,C Lishka,Y B Pan,J R Pater,Y Saadi,V Sharma,M Schmitt,Z H Shi,Y H Tang,A M Walsh,F V Weber,M H Whitney,Sau Lan Wu,Xifeng Wu,G Zobernig,D Decamp,B Deschizeaux,C Goy,J P Lees,M N Minard,R Alemany,F Ariztizabal,P Comasillas,J M Crespo,M Delfino,E Fernandez,V Gaitan,L Garrido,Ll M Mir,A Pacheco,A Pascual,D Creanza,M De Palma,A Farilla,G Iaselli,G Maggi,M Maggi,S Natali,S Nuzzo,M Quattromini,A Ranieri,G Raso,F Romano,F Ruggieri,G Selvaggi,L Silvestris,P Tempesta,G Zito,H Hu,Dejia Huang,X Huang, Jianyi Lin,J Lou,Chunming Qiao,Ting Wang,Y Xie,Dan Xu, Ruisong Xu,Jinzhong Zhang,Weian Zhao,W B Atwood,L A T Bauerdick,E Blucher,G Bonvicini,F Bossi,J Boudreau,T H Burnett,H Drevermann,R Forty,R Hagelberg,S J Haywood,J Hilgart,R G Jacobsen,B Jost,M Kasemann,J Knobloch,E Lancon,I Lehraus,T Lohse,A Lusiani,M Martinez,P Mato,T S Mattison,H Meinhard,S Menary,T O Meyer,A Minten,A Miotto,R Miquel,H G Moser,J Nash,P Palazzi,J A Perlas,F Ranjard,G Redlinger,L Rolandi,A Roth,J Rothberg,T Ruan,M Saich,D Schlatter,M Schmelling,F Sefkow,W Tejessy,H Wachsmuth,W Wiedenmann,T Wildish,W Witzeling,J Wotschack,Z Ajaltouni,Frederique Badaud,M Bardadinotwinowska,A M Bencheikh,R El Fellous,A Falvard,P Gay,C Guicheney,P Henrard,J Jousset,B Michel,J C Montret,D Pallin,P Perret,B Pietrzyk,J Proriol, E Prulhiere,G Stimpfl,J D Hansen,P H Hansen,R Mollerud,B S Nilsson,I Efthymiopoulos,E Simopoulou,A Vayaki,J Badier,A Blondel,G R Bonneaud,J C Brient,G Fouque,A Gamess,J Harvey,S Orteu,A Rosowsky,A Rouge,M Rumpf,R Tanaka,H Videau,D J Candlin,M I Parsons,E Veitch,L Moneta,G Parrini,M Corden,C Georgiopoulos,M Ikeda,John J Lannutti,D Levinthal,M Mermikides,L Sawyer,S Wasserbaech,A Antonelli,R Baldini,G Bencivenni,G Bologna,P Campana,G Capon,F Cerutti,V Chiarella,B Dettorrepiazzoli,G Felici,P Laurelli,G Mannocchi,F Murtas,G P Murtas,L Passalacqua,M Pepealtarelli,P Picchi,B Altoon,O Boyle,P Colrain,I Ten Have,J G Lynch,W Maitland,W T Morton,C Raine,J M Scarr,K M Smith,A S Thompson,R M Turnbull,Bernhard R Brandl,O Braun,R Geiges,C Geweniger,P Hanke,V Hepp,E E Kluge,Y Maumary,A Putzer,B Rensch,Achim Stahl,K Tittel,M Wunsch,A T Belk,R Beuselinck,D M Binnie,W Cameron,M Cattaneo,David Colling,P J Dornan,S Dugeay,A M Greene,J F Hassard,N M Lieske,S J Patton,D G Payne,M J Phillips,J K Sedgbeer,Gordon C Taylor,I R Tomalin,A G Wright,P Girtler,D Kuhn,G Rudolph,C K Bowdery,T J Brodbeck,A J Finch,F Foster,G Hughes,Donald C Jackson,N R Keemer,M Nuttall,A Patel,T Sloan,S W Snow,E P Whelan,T Barczewski,K Kleinknecht,J Raab,B Renk,S Roehn,H G Sander, H G Schmidt,F Steeg,S M Walther,B A Wolf,J J Aubert,C Benchouk,V Bernard,A Bonissent,J Carr,P Coyle,J Drinkard,F Etienne,S Papalexiou,P Payre,Ziliang Qian,D Rosseau,Ph Schwemling,M Talby,S Adlung, Harold L Becker,W Blum,D N Brown,P W Cattaneo,G Cowan,B Dehning,H Dietl,F Dydak,M Fernandezbosman,M Frank,A W Halley,T Hanslkozanecka,J Lauber,G Lutjens,G Lutz,W Manner,R Richter,H Rotscheidt,J M Schroder,A S Schwarz,R Settles,U Stierlin,U Stiegler,R St Denis,M Takashima,J P Thomas,Gregory T Wolf,V Bertin,J Boucrot,O Callot,Xu Chen,A Cordier,M Davier,J F Grivaz,P Heusse,P Janot,D W Kim,F Le Diberder,J Lefrancois,A M Lutz,M H Schune,J J Veillet,I Videau,Z Zhang,F Zomer,D Abbaneo,S R Amendolia,G Bagliesi,G Batignani,L Bosisio,U Bottigli,C Bradaschia,M Carpinelli,M A Ciocci,R Dellorso,I Ferrante,F Fidecaro,L Foa,E Focardi,F Forti,C Gatto,A Giassi,M A Giorgi,F Ligabue,E B Mannelli,P S Marrocchesi,A Messineo,F Palla,G Rizzo,G Sanguinetti,J Steinberger,R Tenchini,G Tonelli,G Triggiani,C Vannini,A Venturi,P G Verdini,J Walsh,J M Carter,M G Green,P V March,T Medcalf,I S Quazi,J A Strong,L R West,D R Botterill,R W Clifft,T R Edgecock,M Edwards,S M Fisher,T J Jones,P R Norton,D P Salmon,J C Thompson,B Blochdevaux,P Colas,W Kozanecki,M C Lemaire,E Locci,S Loucatos,E Monnier,P Perez,F Perrier,J Rander,J F Renardy,A Roussarie

Physics Letters B（1992）

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Abstract

We study electron-positron annihilations into six jets at the parton level in perturbative Quantum Chromo-Dynamics (QCD), via the elementary processes ϵ+ϵ− → qq−gggg, ϵ+ϵ− → qq−q′q−′ gg and ϵ+ϵ− → qq−q′q−′q″q−″, for massive quarks q, q′ and q″ and massless gluons g. Several numerical results of phenomenological relevance are given, at three different collider energies and for a representative selection of jet clustering algorithms. We also present helicity amplitudes and colour factors needed for the tree-level calculation.

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Key words

qcd colour factors,decay,triple-gluon

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