ENERGY-DEPENDENCE OF THE DIFFERENCES BETWEEN THE QUARK AND GLUON JET FRAGMENTATION

Authors
ABREU P ADAM W ADYE T AGASI E AJINENKO I ALEKSAN R ALEKSEEV GD ALEMANY R ALLPORT PP ALMEHED S ALVSVAAG SJ AMALDI U AMATO S ANDREAZZA A ANDRIEUX ML ANTILOGUS P APEL WD ARNOUD Y ASMAN B AUGUSTIN JE AUGUSTINUS A BAILLON P BAMBADE P BARAO F BARATE R BARDIN DY BARONCELLI A BARRING O BARRIO JA BARTL W BATES MJ BATTAGLIA M BAUBILLIER M BAUDOT J BECKS KH BEGALLI M BEILLIERE P BELOKOPYTOV Y BELOUS K BENVENUTI AC BERGGREN M BERTRAND D BIANCHI F BIGI M BILENKY MS BILLOIR P BLOCH D BLUME M BLYTH S BOLOGNESE T BONESINI M BONIVENTO W BOOTH PSL BORISOV G BOSIO C BOSWORTH S BOTNER O BOUQUET B BOURDARIOS C BOWCOCK TJV BOZZO M BRANCHINI P BRAND KD BRENKE T BRENNER RA BRICMAN C BRILLAULT L BROWN RCA BRUCKMAN P BRUNET JM BUGGE L BURAN T BURGSMUELLER T BUSCHMANN P BUYS A CABRERA S CACCIA M CALVI M ROZAS AJC CAMPORESI T CANALE V CANEPA M CANKOCAK K CAO F CARENA F CARRILHO P CARROLL L CASO C GIMENEZ MVC CATTAI A CAVALLO FR CERRITO L CHABAUD V CHARPENTIER P CHAUSSARD L CHAUVEAU J CHECCHIA P CHELKOV GA CHEN M CHIERICI R CHLIAPNIKOV P CHOCHULA P CHOROWICZ V CHUDOBA J CINDRO V COLLINS P CONTRERAS JL CONTRI R CORTINA E COSME G COSSUTTI F CRAWLEY HB CRENNELL D CROSETTI G MAESTRO JC CZELLAR S DAHLJENSEN E DAHM J DALMAGNE B DAM M DAMGAARD G DAUNCEY PD DAVENPORT M DASILVA W DEFOIX C DEGHORAIN A DELLARICCA G DELPIERRE P DEMARIA N DEANGELIS A DEBOER W DEBRABANDERE S DECLERCQ C DELAVAISSIERE C DELOTTO B DEMIN A DEPAULA L DESAINTJEAN C DIJKSTRA H DICIACCIO L DJAMA F DOLBEAU J DONSZELMANN M DOROBA K DRACOS M DREES J DREES KA DRIS M DUFOUR Y DUPONT F EDSALL D EHRET R EIGEN G EKELOF T EKSPONG G ELSING M ENGEL JP ERSHAIDAT N ERZEN B SANTO ME FALK E FASSOULIOTIS D FEINDT M FERRER A FILIPPAS TA FIRESTONE A FISCHER PA FOETH H FOKITIS E FONTANELLI F FORMENTI F FRANEK B FRENKIEL P FRIES DC FRODESEN AG FRUHWIRTH R FULDAQUENZER F FUSTER J GALLONI A GAMBA D GANDELMAN M GARCIA C GARCIA J GASPAR C GASPARINI U GAVILLET P GAZIS EN GELE D GERBER JP GERDYUKOV L GIBBS M GOKIELI R GOLOB B GOPAL G GORN L GORSKI M GOUZ Y GRACCO V GRAZIANI E GROSDIDIER G GRZELAK K GUMENYUK S GUNNARSSON P GUNTHER M GUY J HAHN F HAHN S HALLGREN A HAMACHER K HAO W HARRIS FJ HEDBERG V HENRIQUES R HERNANDEZ JJ HERQUET P HERR H HESSING TL HIGON E HILKE HJ HILL TS HOLMGREN SO HOLT PJ HOLTHUIZEN D HOORELBEKE S HOULDEN M HRUBEC J HUET K HULTQVIST K JACKSON JN JACOBSSON R JALOCHA P JANIK R JARLSKOG C JARLSKOG G JARRY P JEANMARIE B JOHANSSON EK JONSSON L JONSSON P JORAM C JUILLOT P KAISER M KAPUSTA F KARAFASOULIS K KARLSSON M KARVELAS E KATSANEVAS S KATSOUFIS EC KERANEN R KHOMENKO BA KHOVANSKI NN KING B KJAER NJ KLAPP O KLEIN H KLOVNING A KLUIT P KOENE B KOKKINIAS P KORATZINOS M KORCYL K KOSTIOUKHINE V KOURKOUMELIS C KOUZNETSOV O KRAMER PH KRAMMER M KREUTER C KRONKVIST I KRUMSTEIN Z KRUPINSKI W KUBINEC P KUCEWICZ W KURVINEN K LACASTA C LAKTINEH I LAMBLOT S LAMSA JW LANCERI L LANE DW LANGEFELD P LAPIN V LAST I LAUGIER JP LAUHAKANGAS R LEDER G LEDROIT F LEFEBURE V LEGAN CK LEITNER R LEMOIGNE Y LEMONNE J LENZEN G LEPELTIER V LESIAK T LINDNER R LIPNIACKA A LIPPI I LOERSTAD B LOKEN JG LOPEZ JM AGUERA MAL LOUKAS D LUTZ P LYONS L MACNAUGHTON J MAEHLUM G MALYCHEV V MANDL F MARCO J MARECHAL B MARGONI M MARIN JC MARIOTTI C MARKOU A MARON T MARTINEZRIVERO C MARTINEZVIDAL F GARCIA SM MASIK J MATORRAS F MATTEUZZI C MATTHIAE G MAZZUCATO M MCCUBBIN M MCKAY R MCNULTY R MEDBO J MERONI C MEYER S MEYER WT MICHELOTTO M MIGLIORE E MIRABITO L MITAROFF WA MJOERNMARK U MOA T MOELLER R MOENIG K MONGE MR MORETTINI P MUELLER H MUNDIM LM MURRAY WJ MURYN B MYATT G NARAGHI F NAVARRIA FL NAVAS S NAWROCKI K NEGRI P NEUMANN W NEUMEISTER N NICOLAIDOU R NIELSEN BS NIEUWENHUIZEN M NIKOLAENKO V NISS P NOMEROTSKI A NORMAND A OBERSCHULTEBECKMANN W OBRAZTSOV V OLSHEVSKI AG ONOFRE A ORAVA R OSTERBERG K OURAOU A PAGANINI P PAGANONI M PAGES P PALKA H PAPADOPOULOU TD PAPAGEORGIOU K PAPE L PARKES C PARODI F PASSERI A PEGORARO M PERALTA L PERNEGGER H PERNICKA M PERROTTA A PETRIDOU C PETROLINI A PETROVYCK M PHILLIPS HT PIANA G PIERRE F PIMENTA M PINDO M PLASZCZYNSKI S PODOBRIN O POL ME POLOK G POROPAT P POZDNIAKOV V PREST M PRIVITERA P PUKHAEVA N PULLIA A RADOJICIC D RAGAZZI S RAHMANI H RAMES J RATOFF PN READ AL REALE M REBECCHI P REDAELLI NG REGLER M REID D RENTON PB RESVANIS LK RICHARD F RICHARDSON J RIDKY J RINAUDO G RIPP I ROMERO A RONCAGLIOLO I RONCHESE P ROOS L ROSENBERG EI ROSSO E ROUDEAU P ROVELLI T RUCKSTUHL W RUHLMANNKLEIDER V RUIZ A SAARIKKO H SACQUIN Y SADOVSKY A SAJOT G SALT J SANCHEZ J SANNINO M SCHIMMELPFENNIG M SCHNEIDER H SCHWICKERATH U SCHYNS MAE SCIOLLA G SCURI F SEAGER P SEDYKH Y SEGAR AM SEITZ A SEKULIN R SHELLARD RC SICCAMA I SIEGRIST P SIMONETTI S SIMONETTO F SISAKIAN AN SITAR B SKAALI TB SMADJA G SMIRNOV N SMIRNOVA O SMITH GR SOSNOWSKI R SOUZASANTOS D SPASSOV T SPIRITI E SPONHOLZ P SQUARCIA S STANESCU C STAPNES S STAVITSKI I STICHELBAUT F STOCCHI A STRAUSS J STRUB R STUGU B SZCZEKOWSKI M SZEPTYCKA M TABARELLI T TAVERNET JP TCHIKILEV O TILQUIN A TIMMERMANS J TKATCHEV LG TODOROV T TOET DZ TOMARADZE A TOME B TONAZZO A TORTORA L TRANSTROMER G TREILLE D TRISCHUK W TRISTRAM G TROMBINI A TRONCON C TSIROU A TURLUER ML TYAPKIN IA TYNDEL M TZAMARIAS S UEBERSCHAER B ULLALAND O UVAROV V
Citation
P. Abreu et al., ENERGY-DEPENDENCE OF THE DIFFERENCES BETWEEN THE QUARK AND GLUON JET FRAGMENTATION, Zeitschrift fur Physik. C, Particles and fields, 70(2), 1996, pp. 179-195
Citations number
67
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
70
Issue
2
Year of publication
1996
Pages
179 - 195
Database
ISI
SICI code
0170-9739(1996)70:2<179:EOTDBT>2.0.ZU;2-C
Abstract
Three jet events arising from decays of the Z beson, collected by the DELPHI detector, were used to measure differences in quark and gluon f ragmentation. Gluon jets were anti-tagged by identifying b quark jets. Unbiased quark jets came from events with two jets plus one photon. Q uark and gluon jet properties in different energy ranges were compared for the first time within the same detector. Quark and gluon jets of nearly the same energy in symmetric three jet event topologies were al so compared. Using three independent methods, the average value of the ratio of the mean charged multiplicities of gluon and quark jets is [ r ] = 1.241 +/- 0.015 (stat.) +/- 0.025 (syst.). Gluon jets are broad er and produce fragments with a softer energy spectrum than quark jets of equivalent energy. The string effect has been observed in fully sy mmetric three jet events. The measured ratio R(gamma) of the charged p article flow in the <q (q) over bar> inter-jet region of the <q (q) ov er bar g> and < q (q) over bar gamma> samples agrees with the perturba tive QCD expectation. The dependence of the mean charged multiplicity on the hadronic center-of-mass energy was analysed in photon plus n-je t events. The value for alpha(s)(M(z)) determined from these data usin g a QCD prediction with corrections at leading and next-to-leading ord er is alpha(s)(M(z)) = 0.116 +/- 0.003 (stat.) +/- 0.009 (syst.).