EVIDENCE FOR THE TRIPLE-GLUON VERTEX FROM MEASUREMENTS OF THE QCD COLOR FACTORS IN Z-DECAY INTO 4 JETS

Decamp, D; Deschizeaux, B; Goy, C; Lees, Jp; Minard, Mn; Alemany, R; Ariztizabal, F; Comasillas, P; Crespo, Jm; Delfino, M; Fernandez, E; Gaitan, V; Garrido, L; Mir, Lm; Pacheco, A; Pascual, A; Creanza, D; Depalma, M; Farilla, A; Iaselli, G; Maggi, G; Maggi, M; Natali, S; Nuzzo, S; Quattromini, M; Ranieri, A; Raso, G; Romano, F; Ruggieri, F; Selvaggi, G; Silvestris, L; Tempesta, P; Zito, G; Gao, Y; Hu, H; Huang, D; Huang, X; Lin, J; Lou, J; Qiao, C; Wang, T; Xie, Y; Xu, D; Xu, R; Zhang, J; Zhao, W; Atwood, Wb; Bauerdick, Lat; Blucher, E; Bonvicini, G; Bossi, F; Boudreau, J; Burnett, Th; Drevermann, H; Forty, Rw; Hagelberg, R; Haywood, S; Hilgart, J; Jacobsen, R; Jost, B; Kasemann, M; Knobloch, J; Lancon, E; Lehraus, I; Lohse, T; Lusiani, Alberto; Martinez, M; Mato, P; Mattison, T; Meinhard, H; Menary, S; Meyer, T; Minten, A; Miotto, A; Miquel, R; Moser, Hg; Nash, J; Palazzi, P; Perlas, Ja; Ranjard, F; Redlinger, G; Rolandi, Luigi; Roth, A; Rothberg, J; Ruan, T; Saich, M; Schlatter, D; 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Colrain, P; Tenhave, I; Lynch, Jg; Maitland, W; Morton, Wt; Raine, C; Scarr, Jm; Smith, K; Thompson, As; Turnbull, Rm; Brandl, B; Braun, O; Geiges, R; Geweniger, C; Hanke, P; Hepp, V; Kluge, Ee; Maumary, Y; Putzer, A; Rensch, B; Stahl, A; Tittel, K; Wunsch, M; Belk, At; Beuselinck, R; Binnie, Dm; Cameron, W; Cattaneo, M; Colling, Dj; Dornan, Pj; Dugeay, S; Greene, Am; Hassard, Jf; Lieske, Nm; Patton, Sj; Payne, Dg; Phillips, Mj; Sedgbeer, Jk; Taylor, G; Tomalin, Ir; Wright, Ag; Girtler, P; Kuhn, D; Rudolph, G; Bowdery, Ck; Brodbeck, Tj; Finch, Aj; Foster, F; Hughes, G; Jackson, D; Keemer, Nr; Nuttall, M; Patel, A; Sloan, T; Snow, Sw; Whelan, Ep; Barczewski, T; Kleinknecht, K; Raab, J; Renk, B; Roehn, S; Sander, Hg; Schmidt, H; Steeg, F; Walther, Sm; Wolf, B; Aubert, Jj; Benchouk, C; Bernard, V; Bonissent, A; Carr, J; Coyle, P; Drinkard, J; Etienne, F; Papalexiou, S; Payre, P; Qian, Z; Rousseau, D; Schwemling, P; Talby, M; Adlung, S; Becker, H; Blum, W; Brown, D; Cattaneo, P; Cowan, G; 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Clifft, Rw; Edgecock, Tr; Edwards, M; Fisher, Sm; Jones, Tj; Norton, Pr; Salmon, Dp; Thompson, Jc; Blochdevaux, B; Colas, P; Kozanecki, W; Lemaire, Mc; Locci, E; Loucatos, S; Monnier, E; Perez, P; Perrier, F; Rander, J; Renardy, Jf; Roussarie, A; Schuller, Jp; Schwindling, J; Simohand, D; Vallage, B; Johnson, Rp; Litke, Am; Wear, J; Ashman, Jg; Babbage, W; Booth, Cn; Buttar, C; Carney, Re; Cartwright, S; Combley, F; Hatfield, F; Martin, J; Parker, D; Reeves, P; Thompson, Lf; Barberio, E; Brandt, S; Grupen, C; Mirabito, L; Schafer, U; Seywerd, H; Ganis, G; Giannini, G; Gobbo, B; Ragusa, F; Bellantoni, L; Cinabro, D; Conway, Js; Cowen, Df; Feng, Z; Ferguson, Dps; Gao, Ys; Grahl, J; Harton, Jl; Jared, Rc; Leclaire, Bw; Lishka, C; Pan, Yb; Pater, Jr; Saadi, Y; Sharma, V; Schmitt, M; Shi, Zh; Tang, Yh; Walsh, Am; Weber, Fv; Whitney, Mh; Wu, Sl; Wu, X; Zobernig, G; Denis Richard/C 8997 2012 Forti Francesco/H 3035 2011 Ferrante Isidoro/F 1017 2012, RI Perrier Frederic/A 5953 2011 ANTONELLI ANTONELLA/C 6238 2011 Buttar Craig/D 3706 2011 Stahl Achim/E 8846 2011 Passalacqua Luca/F 5127 2011 Murtas Fabrizio/B 5729 2012 S. t.

doi:10.1016/0370-2693(92)91941-2

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A sample of 4148 four-jet events observed in the ALEPH-detector at LEP in 1989 and 1990 is used to test the underlying gauge group of strong interactions. A fit to the ratios of the "colour factors" C(F), N(C) and T(F), which determine the differential cross sections, yields N(C)/C(F) = 2.24 +/- 0.32stat +/- 0.24syst and T(F)/C(F) = 0.58 +/- 0.17stat +/- 0.23syst. This is in agreement with the values expected from QCD: N(C)/C(F) = 2.25 and T(F)/C(F) = 0.375. The non-zero value of N(C)/C(F) constitutes direct evidence for the existence of the triple-gluon coupling and excludes any abelian gauge theory by more than five standard deviations.

Titolo:	EVIDENCE FOR THE TRIPLE-GLUON VERTEX FROM MEASUREMENTS OF THE QCD COLOR FACTORS IN Z-DECAY INTO 4 JETS
Autori:	DECAMP D DESCHIZEAUX B GOY C LEES JP MINARD MN ALEMANY R ARIZTIZABAL F COMASILLAS P CRESPO JM DELFINO M FERNANDEZ E GAITAN V GARRIDO L MIR LM PACHECO A PASCUAL A CREANZA D DEPALMA M FARILLA A IASELLI G MAGGI G MAGGI M NATALI S NUZZO S QUATTROMINI M RANIERI A RASO G ROMANO F RUGGIERI F SELVAGGI G SILVESTRIS L TEMPESTA P ZITO G GAO Y HU H HUANG D HUANG X LIN J LOU J QIAO C WANG T XIE Y XU D XU R ZHANG J ZHAO W ATWOOD WB BAUERDICK LAT BLUCHER E BONVICINI G BOSSI F BOUDREAU J BURNETT TH DREVERMANN H FORTY RW HAGELBERG R HAYWOOD S HILGART J JACOBSEN R JOST B KASEMANN M KNOBLOCH J LANCON E LEHRAUS I LOHSE T LUSIANI, Alberto MARTINEZ M MATO P MATTISON T MEINHARD H MENARY S MEYER T MINTEN A MIOTTO A MIQUEL R MOSER HG NASH J PALAZZI P PERLAS JA RANJARD F REDLINGER G ROLANDI, LUIGI ROTH A ROTHBERG J RUAN T SAICH M SCHLATTER D SCHMELLING M SEFKOW F TEJESSY W WACHSMUTH H WIEDENMANN W WILDISH T WITZELING W WOTSCHACK J AJALTOUNI Z BADAUD F BARDADINOTWINOWSKA M BENCHEIKH AM ELFELLOUS R FALVARD A GAY P GUICHENEY C HENRARD P JOUSSET J MICHEL B MONTRET JC PALLIN D PERRET P PIETRZYK B PRORIOL J PRULHIERE F STIMPFL G HANSEN JD HANSEN JR HANSEN PH MOLLERUD R NILSSON BS EFTHYMIOPOULOS I SIMOPOULOU E VAYAKI A BADIER J BLONDEL A BONNEAUD G BRIENT JC FOUQUE G GAMESS A HARVEY J ORTEU S ROSOWSKY A ROUGE A RUMPF M TANAKA R VIDEAU H CANDLIN DJ PARSONS MI VEITCH E MONETA L PARRINI G CORDEN M GEORGIOPOULOS C IKEDA M LANNUTTI J LEVINTHAL D MERMIKIDES M SAWYER L WASSERBAECH S ANTONELLI A BALDINI R BENCIVENNI G BOLOGNA G CAMPANA P CAPON G CERUTTI F CHIARELLA V DETTORREPIAZZOLI B FELICI G LAURELLI P MANNOCCHI G MURTAS F MURTAS GP PASSALACQUA L PEPEALTARELLI M PICCHI P ALTOON B BOYLE O COLRAIN P TENHAVE I LYNCH JG MAITLAND W MORTON WT RAINE C SCARR JM SMITH K THOMPSON AS TURNBULL RM BRANDL B BRAUN O GEIGES R GEWENIGER C HANKE P HEPP V KLUGE EE MAUMARY Y PUTZER A RENSCH B STAHL A TITTEL K WUNSCH M BELK AT BEUSELINCK R BINNIE DM CAMERON W CATTANEO M COLLING DJ DORNAN PJ DUGEAY S GREENE AM HASSARD JF LIESKE NM PATTON SJ PAYNE DG PHILLIPS MJ SEDGBEER JK TAYLOR G TOMALIN IR WRIGHT AG GIRTLER P KUHN D RUDOLPH G BOWDERY CK BRODBECK TJ FINCH AJ FOSTER F HUGHES G JACKSON D KEEMER NR NUTTALL M PATEL A SLOAN T SNOW SW WHELAN EP BARCZEWSKI T KLEINKNECHT K RAAB J RENK B ROEHN S SANDER HG SCHMIDT H STEEG F WALTHER SM WOLF B AUBERT JJ BENCHOUK C BERNARD V BONISSENT A CARR J COYLE P DRINKARD J ETIENNE F PAPALEXIOU S PAYRE P QIAN Z ROUSSEAU D SCHWEMLING P TALBY M ADLUNG S BECKER H BLUM W BROWN D CATTANEO P COWAN G DEHNING B DIETL H DYDAK F FERNANDEZBOSMAN M FRANK M HALLEY AW HANSLKOZANECKA T LAUBER J LUTJENS G LUTZ G MANNER W PAN Y RICHTER R ROTSCHEIDT H SCHRODER J SCHWARZ AS SETTLES R STIERLIN U STIEGLER U STDENIS R TAKASHIMA M THOMAS J WOLF G BERTIN V BOUCROT J CALLOT O CHEN X CORDIER A DAVIER M GRIVAZ JF HEUSSE P JANOT P KIM DW LEDIBERDER F LEFRANCOIS J LUTZ AM SCHUNE MH VEILLET JJ VIDEAU I ZHANG Z ZOMER F ABBANEO D AMENDOLIA SR BAGLIESI G BATIGNANI G BOSISIO L BOTTIGLI U BRADASCHIA C CARPINELLI M CIOCCI MA DELLORSO R FERRANTE I FIDECARO F FOA L FOCARDI E FORTI F GATTO C GIASSI A GIORGI MA LIGABUE, FRANCO MANNELLI EB MARROCCHESI PS MESSINEO A PALLA F RIZZO G SANGUINETTI G STEINBERGER J TENCHINI R TONELLI G TRIGGIANI G VANNINI C VENTURI A VERDINI PG WALSH J CARTER JM GREEN MG MARCH PV MEDCALF T QUAZI IS STRONG JA WEST LR BOTTERILL DR CLIFFT RW EDGECOCK TR EDWARDS M FISHER SM JONES TJ NORTON PR SALMON DP THOMPSON JC BLOCHDEVAUX B COLAS P KOZANECKI W LEMAIRE MC LOCCI E LOUCATOS S MONNIER E PEREZ P PERRIER F RANDER J RENARDY JF ROUSSARIE A SCHULLER JP SCHWINDLING J SIMOHAND D VALLAGE B JOHNSON RP LITKE AM WEAR J ASHMAN JG BABBAGE W BOOTH CN BUTTAR C CARNEY RE CARTWRIGHT S COMBLEY F HATFIELD F MARTIN J PARKER D REEVES P THOMPSON LF BARBERIO E BRANDT S GRUPEN C MIRABITO L SCHAFER U SEYWERD H GANIS G GIANNINI G GOBBO B RAGUSA F BELLANTONI L CINABRO D CONWAY JS COWEN DF FENG Z FERGUSON DPS GAO YS GRAHL J HARTON JL JARED RC LECLAIRE BW LISHKA C PAN YB PATER JR SAADI Y SHARMA V SCHMITT M SHI ZH TANG YH WALSH AM WEBER FV WHITNEY MH WU SL WU X ZOBERNIG G RI Perrier Frederic/A 5953 2011 ANTONELLI ANTONELLA/C 6238 2011 Buttar Craig/D 3706 2011 Stahl Achim/E 8846 2011 Passalacqua Luca/F 5127 2011 Murtas Fabrizio/B 5729 2012 S.t. Denis Richard/C 8997 2012 Forti Francesco/H 3035 2011 Ferrante Isidoro/F 1017 2012 mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	1992
Rivista:	PHYSICS LETTERS. SECTION B
Abstract:	A sample of 4148 four-jet events observed in the ALEPH-detector at LEP in 1989 and 1990 is used to test the underlying gauge group of strong interactions. A fit to the ratios of the "colour factors" C(F), N(C) and T(F), which determine the differential cross sections, yields N(C)/C(F) = 2.24 +/- 0.32stat +/- 0.24syst and T(F)/C(F) = 0.58 +/- 0.17stat +/- 0.23syst. This is in agreement with the values expected from QCD: N(C)/C(F) = 2.25 and T(F)/C(F) = 0.375. The non-zero value of N(C)/C(F) constitutes direct evidence for the existence of the triple-gluon coupling and excludes any abelian gauge theory by more than five standard deviations.
Handle:	http://hdl.handle.net/11384/3613
Appare nelle tipologie:	1.1 Articolo in rivista

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