A MEASUREMENT OF THE QCD COLOR FACTORS AND A LIMIT ON THE LIGHT GLUINO

Authors
BARATE R BUSKULIC D DECAMP D GHEZ P GOY C LEES JP LUCOTTE A MINARD MN NIEF JY ODIER P PIETRZYK B CASADO MP CHMEISSANI M COMAS P CRESPO JM DELFINO M FERNANDEZ E FERNANDEZBOSMAN M GARRIDO L JUSTE A MARTINEZ M MIQUEL R MIR LM ORTEU S PADILLA C PARK IC PASCUAL A PERLAS JA RIU I SANCHEZ F TEUBERT F COLALEO A CREANZA D DEPALMA M GELAO G IASELLI G MAGGI G MAGGI R MARINELLI N NUZZO S RANIERI A RASO G RUGGIERI F SELVAGGI G SILVESTRIS L TEMPESTA P TRICOMI A ZITO G HUANG X LIN J OUYANG Q WANG T XIE Y XU R XUE S ZHANG J ZHANG L ZHAO W ABBANEO D ALEMANY R BAZARKO AO BRIGHTTHOMAS P CATTANEO M CERUTTI F DREVERMANN H FORTY RW FRANK M HAGELBERG R HARVEY J JANOT P JOST B KNERINGER E KNOBLOCH J LEHRAUS I LUTTERS G MATO P MINTEN A MONETA L PACHECO A PUSZTASZERI JF RANJARD F RENSING P RIZZO G ROLANDI L SCHLATTER D SCHMELLING M SCHMITT M SCHNEIDER O TEJESSY W TOMALIN IR WACHSMUTH H WAGNER A AJALTOUNI Z BARRES A BOYER C FALVARD A FERDI C GAY P GUICHENEY C HENRARD P JOUSSET J MICHEL B MONTEIL S MONTRET JC PALLIN D PERRET P PODLYSKI F PRORIOL J ROSNET P ROSSIGNOL JM FEARNLEY T HANSEN JB HANSEN JD HANSEN JR HANSEN PH NILSSON BS RENSCH B WAANANEN A DASKALAKIS G KYRIAKIS A MARKOU C SIMOPOULOU E SIOTIS I VAYAKI A ZACHARIADOU K BLONDEL A BONNEAUD G BRIENT JC BOURDON P ROUGE A RUMPF M VALASSI A VERDERI M VIDEAU H CANDLIN DJ PARSONS MI FOCARDI E PARRINI G CORDEN M GEORGIOPOULOS C JAFFE DE ANTONELLI A BENCIVENNI G BOLOGNA G BOSSI F CAMPANA P CAPON G CASPER D CHIARELLA V FELICI G LAURELLI P MANNOCCHI G MURTAS F MURTAS GP PASSALACQUA L PEPEALTARELLI M CURTIS L DORRIS SJ HALLEY AW KNOWLES IG LYNCH JG OSHEA V RAINE C SCARR JM SMITH K TEIXEIRADIAS P THOMPSON AS THOMSON E THOMSON F TURNBULL RM BECKER U GEWENIGER C GRAEFE G HANKE P HANSPER G HEPP V KLUGE EE PUTZER A SCHMIDT M SOMMER J TITTEL K WERNER S WUNSCH M BEUSELINCK R BINNIE DM CAMERON W DORNAN PJ GIRONE M GOODSIR S MARTIN EB MOUTOUSSI A NASH J SEDGBEER JK STACEY AM WILLIAMS MD DISSERTORI G GIRTLER P KUHN D RUDOLPH G BETTERIDGE AP BOWDERY CK COLRAIN P CRAWFORD G FINCH AJ FOSTER F HUGHES G SLOAN T WILLIAMS MI GALLA A GIEHL I GREENE AM HOFFMANN C JAKOBS K KLEINKNECHT K QUAST G RENK B ROHNE E SANDER HG VANGEMMEREN P ZEITNITZ C AUBERT JJ BENCHOUK C BONISSENT A BUJOSA G CALVET D CARR J COYLE P DIACONU C ETIENNE F KONSTANTINIDIS N LEROY O PAYRE P ROUSSEAU D TALBY M SADOUKI A THULASIDAS M TRABELSI K ALEPPO M RAGUSA F BERLICH R BLUM W BUSCHER V DIETL H DYDAK F GANIS G GOTZHEIN C KROHA H LUTJENS G LUTZ G MANNER W MOSER HG RICHTER R ROSADOSCHLOSSER A SCHAEL S SETTLES R SEYWERD H DENIS RS STENZEL H WIEDENMANN W WOLF G BOUCROT J CALLOT O CHEN S CHOI Y CORDIER A DAVIER M DUFLOT L GRIVAZ JF HEUSSE P HOCKER A JACHOLKOWSKA A JACQUET M KIM DW LEDIBERDER F LEFRANCOIS J LUTZ AM NIKOLIC I PARK HJ SCHUNE MH SIMION S VEILLET JJ VIDEAU I ZERWAS D AZZURRI P BAGLIESI G BATIGNANI G BETTARINI S BOZZI C CALDERINI G CARPINELLI M CIOCCI MA CIULLI V DELLORSO R FANTECHI R FERRANTE I FOA L FORTI F GIASSI A GIORGI MA GREGORIO A LIGABUE F LUSIANI A MARROCCHESI PS MESSINEO A PALLA F SANGUINETTI G SCIABA A SPAGNOLO P STEINBERGER J TENCHINI R TONELLI G VANNINI C VENTURI A VERDINI PG BLAIR GA BRYANT LM CHAMBERS JT GAO Y GREEN MG MEDCALF T PERRODO P STRONG JA VONWIMMERSPERGTOELLER JH BOTTERILL DR CLIFFT RW EDGECOCK TR HAYWOOD S MALEY P NORTON PR THOMPSON JC WRIGHT AE BLOCHDEVAUX B COLAS P EMERY S KOZANECKI W LANCON E LEMAIRE MC LOCCI E PEREZ P RANDER J RENARDY JF ROUSSARIE A SCHULLER JP SCHWINDLING J TRABELSI A VALLAGE B BLACK SN DANN JH JOHNSON RP KIM HY LITKE AM MCNEIL MA TAYLOR G BOOTH CN BOSWELL R BREW CAJ CARTWRIGHT S COMBLEY F KELLY MS LEHTO M NEWTON WM REEVE J THOMPSON LF BOHRER A BRANDT S COWAN G GRUPEN C SARAIVA P SMOLIK L STEPHAN F APOLLONIO M BOSISIO L DELLAMARINA R GIANNINI G GOBBO B MUSOLINO G ROTHBERG J WASSERBAECH S ARMSTRONG SR ELMER P FENG Z FERGUSON DPS GAO YS GONZALEZ S GRAHL J GREENING TC HAYES OJ HU H MCNAMARA PA NACHTMAN JM OREJUDOS W PAN YB SAADI Y SCOTT IJ WALSH J WU SL WU X YAMARTINO JM ZHENG M ZOBERNIG G
Citation
R. Barate et al., A MEASUREMENT OF THE QCD COLOR FACTORS AND A LIMIT ON THE LIGHT GLUINO, Zeitschrift fur Physik. C, Particles and fields, 76(1), 1997, pp. 1-14
Citations number
45
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
76
Issue
1
Year of publication
1997
Pages
1 - 14
Database
ISI
SICI code
0170-9739(1997)76:1<1:AMOTQC>2.0.ZU;2-0
Abstract
Using data collected from 1992 to 1995 with the ALEPH detector at LEP, a measurement of the colour factor ratios C-A/C-F and T-F/C-F and the strong coupling constant <(alpha)over bar (s)> = C-F alpha(s), (M-Z)/ (2 pi) has been performed by fitting theoretical predictions simultane ously to the measured differential two-jet rate and angular distributi ons in four-jet events. The result is found to be in excellent agreeme nt with QCD. C-A/C-F = 2.20 +/- 0.09 (stat) +/- 0.13 (syst), T-F/C-F = 0.29 +/- 0.05 (stat) +/- 0.06 (syst). Fixing C-A/C-F and T-F/C-F to t he QCD values permits a determination of alpha(s) (M-Z) and n(f), the number of active flavours. With this measurement the existence of a gl uino with mass below 6.3 GeV/c(2) is excluded at 95% confidence level.