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Measurement of the triple-gluon vertex from 4-jet events at LEP
Authors
P. Abreu Adam, W. Adye, T. Agasi, E. Aleksan, R. Alekseev, G.D. Algeri, A. Allen, P. Almehed, S. Alsvaag, S.J. Amaldi, U. Andreazza, A. Antilogus, P. Apel, W.-D. Apsimon, R.J. Arnoud, Y. Åsman, B. Augustin, J.-E. Augustinus, A. Baillon, P. Bambade, P. Barao, F. Barate, R. Barbiellini, G. Bardin, D.Y. Barker, G.J. Baroncelli, A. Barring, O. Barrio, J.A. Bartl, W. Bates, M.J. Battaglia, M. Baubillier, M. Becks, K.-H. Beeston, C.J. Begalli, M. Beilliere, P. Belokopytov, Yu. Beltran, P. Benedic, D. Benvenuti, A.C. Berggren, M. Bertrand, D. Bianchi, F. Bilenky, M.S. Billoir, P. Bjarne, J. Bloch, D. Blyth, S. Bocci, V. Bogolubov, P.N. Bolognese, T. Bonesini, M. Bonivento, W. Booth, P.S.L. Borisov, G. Borner, H. Bosio, C. Bostiancic, B. Bosworth, S. Botner, O. Bouquet, B. Bourdarios, C. Bowcock, T.J.V. Bozzo, M. Braibant, S. Branchini, P. Brand, K.D. Brenner, R.A. Briand, H. Bricman, C. Brown, R.C.A. Brummer, N. Brunet, J.-M. Bugge, L. Buran, T. Burmeister, H. Buytaert, J.A.M.A. Caccia, M. Calvi, M. Camacho Rozas, A.J. Campion, R. Camporesi, T. Canale, V. Cao, F. Carena, F. Carroll, L. Caso, C. Castillo Gimenez, M.V. Cattai, A. Cavallo, F.R. Cerrito, L. Chabaud, V. Chan, A. Chapkin, M. Charpentier, Ph. Chaussard, L. Chauveau, J. Checchia, P. Chelkov, G.A. Chevalier, L. Chliapnikov, P. Chorowicz, V. Chrin, J.T.M. Collins, P. Contreras, J.L. Contri, R. Cortina, E. Cosme, G. Couchot, F. Crawley, H.B. Crennell, D. Crosetti, G. Crozon, M. Cuevas Maestro, J. Czellar, S. Dahl-Jensen, E. Dalmagne, B. Dam, M. Damgaard, G. Darbo, G. Daubie, E. Daum, A. Dauncey, P.D. Davenport, M. David, P. Davies, J. Da Silva, W. Defoix, C. Delpierre, P. Demaria, N. De Angelis, A. De Boeck, H. De Boer, W. De Clerq, C. De Fez Laso, M.D.M. De Groot, N. De La Vaissiere, C. De Lotto, B. De Min, A. Dijkstra, H. Di Ciaccio, L. Dolbeau, J. Donszelmann, M. Doroba, K. Dracos, M. Drees, J. Dris, M. Dufour, Y. Dupont, F. Edsall, D. Eek, L.-O. Eerola, P.A.-M. Ehret, R. Ekelof, T. Ekspong, G. Elliot Peisert, A. Engel, J.-P. Ershaidat, N. Fassouliotis, D. Feindt, M. Fernandez Alonso, M. Ferrer, A. Filippas, T.A. Firestone, A. Foeth, H. Fokitis, E. Fontanelli, F. Forbes, K.A.J. Fousset, J.-L. Francon, S. Franek, B. Frenkiel, P. Fries, D.C. Frodesen, A.G. Fruhwirth, R. Fulda-Quenzer, F. Furnival, K. Furstenau, H. Fuster, J. Gamba, D. Garcia, C. Garcia, J. Gaspar, C. Gasparini, U. Gavillet, Ph. Gazis, E.N. Gerber, J.-P. Giacomelli, P. Gokieli, R. Golob, B. Golovatyuk, V.M. Cadenas, J.J.G.Y. Gopal, G. Gorski, M. Gracco, V. Grant, A. Grard, F. Graziani, E. Grosdidier, G. Gross, E. Grosse-Wiesmann, P. Grossetete, B. Guy, J. Haedinger, U. Hahn, F. Hahn, M. Haider, S. Hakansson, A. Hallgren, A. Halpaap, M. Hamacher, K. De Monchenault, G.H. Hao, W. Harris, F.J. Hedberg, V. Henkes, T. Hernandez, J.J. Herquet, P. Herr, H. Hessing, T.L. Hietanen, I. Higgins, C.O. Higon, E. Hilke, H.J. Hodgson, S.D. Hofmokl, T. Holmes, R. Holmgren, S.-O. Holthuizen, D. Honore, P.F. Hooper, J.E. Houlden, M. Hrubec, J. Huet, K. Hulth, P.O. Hultqvist, K. Ioannou, P. Iversen, P.-S. Jackson, J.N. Jalocha, P. Jarlskog, G. Jarry, P. Jean-Marie, B. Johansson, E.K. Johnson, D. Jonker, M. Jonsson, L. Juillot, P. Kalkanis, G. Kalmus, G. Kapusta, F. Karlsson, M. Karvelas, E. Katsanevas, S. Katsoufis, E.C. Keranen, R. Kesteman, J. Khomenko, B.A. Khovanski, N.N. King, B. Kjaer, N.J. Klein, H. Klovning, A. Kluit, P. Koch-Mehrin, A. Koehne, J.H. Koene, B. Kokkinias, P. Koratzinos, M. Korytov, A.V. Kostioukhine, V. Kourkoumelis, C. Kouznetsov, O. Kramer, P.H. Krolikowski, J. Kronkvist, I. Kruener-Marquis, U. Krupinski, W. Kulka, K. Kurvinen, K. Lacasta, C. Lambropoulos, C. Lamsa, J.W. Lanceri, L. Lapin, V. Laugier, J.-P. Lauhakangas, R. Leder, G. Ledroit, F. Leitner, R. Lemoigne, Y. Lemonne, J. Lenzen, G. Lepeltier, V. Lesiak, T. Levy, J.M. Lieb, E. Liko, D. Lindgren, J. Lindner, R. Lipniacka, A. Lippi, I. Loerstad, B. Lokajicek, M. Loken, J.G. Lopez-Fernandez, A. Aguera, M.A.L. Los, M. Loukas, D. Lozano, J.J. Lutz, P. Lyons, L. Maehlum, G. Maillard, J. Maio, A. Maltezos, A. Mandl, F. Marco, J. Margoni, M. Marin, J.-C. Markou, A. Maron, T. Marti, S. Mathis, L. Matorras, F. Matteuzzi, C. Matthiae, G. Mazzucato, M. Mc Cubbin, M. Mc Kay, R. Mc Nulty, R. Meola, G. Meroni, C. Meyer, W.T. Michelotto, M. Mikulec, I. Mirabito, L. Mitaroff, W.A. Mitselmakher, G.V. Mjoernmark, U. Moa, T. Moeller, R. Moenig, K. Monge, M.R. Morettini, P. Mueller, H. Murray, W.J. Muryn, B. Myatt, G. Navarria, F.L. Negri, P. Nicolaidou, R. Nielsen, B.S. Nijjhar, B. Nikolaenko, V. Nilsen, P.E.S. Niss, P. Nomerotski, A. Obraztsov, V. Olshevski, A.G. Orava, R. Ostankov, A. Osterberg, K. Ouraou, A. Paganoni, M. Pain, R. Palka, H. Papadopoulou, Th.D. Pape, L. Parodi, F. Passeri, A. Pegoraro, M. Pennanen, J. Peralta, L. Perevozchikov, V. Pernegger, H. Pernicka, M. Perrotta, A. Petridou, C. Petrolini, A. Pierre, F. Pimenta, M. Pingot, O. Plaszczynski, S. Podobrin, O. Pol, M.E. Polok, G. Poropat, P. Pozdniakov, V. Privitera, P. Pullia, A. Radojicic, D. Ragazzi, S. Rahmani, H. Ratoff, P.N. Read, A.L. Rebecchi, P. Redaelli, N.G. Regler, M. Reid, D. Renton, P.B. Resvanis, L.K. Richard, F. Richardson, M. Ridky, J. Rinaudo, G. Roditi, I. Romero, A. Roncagliolo, I. Ronchese, P. Ronnqvist, C. Rosenberg, E.I. Rossi, S. Rosso, E. Roudeau, P. Rovelli, T. Ruckstuhl, W. Ruhlmann-Kleider, V. Ruiz, A. Rybicki, K. Saarikko, H. Sacquin, Y. Sajot, G. Salt, J. Sanchez, J. Sannino, M. Schael, S. Schneider, H. Schyns, M.A.E. Sciolla, G. Scuri, F. Segar, A.M. Seitz, A. Sekulin, R. Sessa, M. Sette, G. Seufert, R. Shellard, R.C. Siccama, I. Siegrist, P. Simonetti, S. Simonetto, F. Sisakian, A.N. Skjevling, G. Smadja, G. Smirnov, N. Smirnova, O. Smith, G.R. Sosnowski, R. Souza-Santos, D. Spassoff, T.S. Spiriti, E. Squarcia, S. Staeck, H. Stanescu, C. Stapnes, S. Stavropoulos, G. Stichelbaut, F. Stocchi, A. Strauss, J. Straver, J. Strub, R. Stugu, B. Szczekowski, M. Szeptycka, M. Szymanski, P. Tabarelli, T. Tchikilev, O. Theodosiou, G.E. Tilquin, A. Timmermans, J. Timofeev, V.G. Tkatchev, L.G. Todorov, T. Toet, D.Z. Toker, O. Tome, B. Torassa, E. Tortora, L. Treille, D. Trevisan, U. Trischuk, W. Tristram, G. Troncon, C. Tsirou, A. Tsyganov, E.N. Turala, M. Turluer, M.-L. Tuuva, T. Tyapkin, I.A. Tyndel, M. Tzamarias, S. Ueberschaer, S. Ullaland, O. Uvarov, V. Valenti, G. Vallazza, E. Valls Ferrer, J.A. Vander Velde, C. Van Apeldoorn, G.W. Van Dam, P. Van Der Heijden, M. Van Doninck, W.K. Vaz, P. Vegni, G. Ventura, L. Venus, W. Verbeure, F. Verlato, M. Vertogradov, L.S. Vilanova, D. Vincent, P. Vitale, L. Vlasov, E. Vodopyanov, A.S. Vollmer, M. Voutilainen, M. Vrba, V. Wahlen, H. Walck, C. Waldner, F. Wayne, M. Wehr, A. Weierstall, M. Weilhammer, P. Werner, J. Wetherell, A.M. Wickens, J.H. Wilkinson, G.R. Williams, W.S.C. Winter, M. Witek, M. Wormser, G. Woschnagg, K. Yamdagni, N. Yepes, P. Zaitsev, A. Zalewska, A. Zalewski, P. Zavrtanik, D. Zevgolatakos, E. Zhang, G. Zimin, N.I. Zito, M. Zuberi, R. Funchal, R.Z. Zumerle, G. Zuniga, J.
Publication date
1 January 1993
Publisher
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 θNR* and the opening angle of the two least energetic jets. A fit to their two-dimensional distribution yields Mathematical expression where CA/CF is the ratio of the coupling strength of the triple-gluon vertex to that of gluon bremsstrahlung from quarks, and NC/NA, 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 to CA/CF. The results are in agreement with the values expected from QCD:CA/CF=2.25, and NC/NA=3/8. © 1993 Springer-Verlag
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