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

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

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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