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Titolo:
A MODEL-INDEPENDENT MEASUREMENT OF QUARK AND GLUON JET PROPERTIES ANDDIFFERENCES
Autore:
AKERS R; ALEXANDER G; ALLISON J; ALTEKAMP N; AMETEWEE K; ANDERSON KJ; ANDERSON S; ARCELLI S; ASAI S; AXEN D; AZUELOS G; BALL AH; BARBERIO E; BARLOW RJ; BARTOLDUS R; BATLEY JR; BEAUDOIN G; BECHTLUFT J; BECK A; BECK GA; BEESTON C; BEHNKE T; BELL KW; BELLA G; BENTVELSEN S; BERLICH P; BETHKE S; BIEBEL O; BLOODWORTH IJ; BOCK P; BOSCH HM; BOUTEMEUR M; BRAIBANT S; BRIGHTTHOMAS P; BROWN RM; BUIJS A; BURCKHART HJ; BURGARD C; BURGIN R; CAPILUPPI P; CARNEGIE RK; CARTER AA; CARTER JR; CHANG CY; CHARLESWORTH C; CHARLTON DG; CHU SL; CLARKE PEL; CLAYTON JC; CLOWES SG; COHEN I; CONBOY JE; COOKE OC; CUFFIANI M; DADO S; DALLAPICCOLA C; DALLAVALLE GM; DARLING C; DEJONG S; DELPOZO LA; DENG H; DIXIT MS; SILVA EDE; DUBOSCQ JE; DUCHOVNI E; DUCKECK G; DUERDOTH IP; DUNWOODY UC; EDWARDS JEG; ESTABROOKS PG; EVANS HG; FABBRI F; FABBRO B; FANTI M; FATH P; FIEDLER F; FIERRO M; FINCKEKEELER M; FISCHER HM; FOLMAN R; FONG DG; FOUCHER M; FUKUI H; FURTJES A; GAGNON P; GAIDOT A; GARY JW; GASCON J; GASCONSHOTKIN SM; GEDDES NI; GEICHGIMBEL C; GENSLER SW; GENTIT FX; GERALIS T; GIACOMELLI G; GIACOMELLI P; GIACOMELLI R; GIBSON V; GIBSON WR; GILLIES JD; GINGRICH DM; GOLDBERG J; GOODRICK MJ; GORN W; GRANDI C; GROSS E; HANSON GG; HANSROUL M; HAPKE M; HARGROVE CK; HART PA; HARTMANN C; HAUSCHILD M; HAWKES CM; HAWKINGS R; HEMINGWAY RJ; HERTEN G; HEUER RD; HILL JC; HILLIER SJ; HILSE T; HOBSON PR; HOCHMAN D; HOMER RJ; HONMA AK; HOWARD R; HUGHESJONES RE; HUTCHCROFT DE; IGOKEMENES P; IMRIE DC; JAWAHERY A; JEFFREYS PW; JEREMIE H; JIMACK M; JOLY A; JONES M; JONES RWL; JOVANOVIC P; KANZAKI J; KARLEN D; KAWAGOE K; KAWAMOTO T; KEELER RK; KELLOGG RG; KENNEDY BW; KING BJ; KING J; KIRK J; KLUTH S; KOBAYASHI T; KOBEL M; KOETKE DS; KOKOTT TP; KOMAMIYA S; KOWALEWSKI R; KRESS T; KRIEGER P; VONKROGH J; KYBERD P; LAFFERTY GD; LAFOUX H; LAHMANN R; LAI WP; LANSKE D; LAUBER J; LAYTER JG; LEE AM; LEFEBVRE E; LELLOUCH D; LETTS J; LEVINSON L; LLOYD SL; LOEBINGER FK; LONG GD; LORAZO B; LOSTY MJ; LUDWIG J; LUIG A; MALIK A; MANNELLI M; MARCELLINI S; MARKUS C; MARTIN AJ; MARTIN JP; MASHIMO T; MATTHEWS W; MATTIG P; MCKENNA J; MCKIGNEY EA; MCMAHON TJ; MCNAB AI; MEIJERS F; MENKE S; MERRITT FS; MES H; MICHELINI A; MIKENBERG G; MILLER DJ; MIR R; MOHR W; MONTANARI A; MORI T; MORII M; MULLER U; NELLEN B; NIJJHAR B; ONEALE SW; OAKHAM FG; ODORICI F; OGREN HO; OLDERSHAW NJ; ORAM CJ; OREGLIA MJ; ORITO S; PALMONARI F; PANSART JP; PATRICK GN; PEARCE MJ; PHILLIPS PD; PILCHER JE; PINFOLD J; PLANE DE; POFFENBERGER P; POLI B; POSTHAUS A; PRITCHARD TW; PRZYSIEZNIAK H; REDMOND MW; REES DL; RIGBY D; RISON MG; ROBINS SA; RODNING N; RONEY JM; ROS E; ROSSI AM; ROSVICK M; ROUTENBURG P; ROZEN Y; RUNGE K; RUNOLFSSON O; RUST DR; SASAKI M; SBARRA C; SCHAILE AD; SCHAILE O; SCHARF F; SCHARFHANSEN P; SCHENK P; SCHMITT B; SCHRODER M; SCHULTZCOULON HC; SCHULZ M; SCHUTZ P; SCHWIENING J; SCOTT WG; SETTLES M; SHEARS TG; SHEN BC; SHEPHERDTHEMISTOCLEOUS CH; SHERWOOD P; SIROLI GP; SKILLMAN A; SKUJA A; SMITH AM; SMITH TJ; SNOW GA; SOBIE R; SOLDNERREMBOLD S; SPRINGER RW; SPROSTON M; STAHL A; STARKS M; STEGMANN C; STEPHENS K; STEUERER J; STOCKHAUSEN B; STROM D; SZYMANSKI P; TAFIROUT R; TARAS P; TAREM S; TECCHIO M; TEIXEIRADIAS P; TESCH N; THOMSON MA; VONTORNE E; TOWERS S; TSCHEULIN M; TSUKAMOTO T; TURCOT AS; TURNERWATSON MF; UTZAT P; VANKOOTEN R; VASSEUR G; VIKAS P; VINCTER M; WACKERLE F; WAGNER A; WAGNER DL; WARD CP; WARD DR; WARD JJ; WATKINS PM; WATSON AT; WATSON NK; WEBER P; WELLS PS; WERMES N; WILKENS B; WILSON GW; WILSON JA; WLODEK T; WOLF G; WOTTON S; WYATT TR; YEKUTIELI G; ZACEK V; ZEUNER W; ZORN GT;
Indirizzi:
UNIV MANCHESTER,SCHUSTER LAB,DEPT PHYS MANCHESTER M13 9PL LANCS ENGLAND UNIV BIRMINGHAM,SCH PHYS & SPACE RES BIRMINGHAM B15 2TT W MIDLANDS ENGLAND UNIV BOLOGNA,DIPARTIMENTO FIS I-40126 BOLOGNA ITALY IST NAZL FIS NUCL I-40126 BOLOGNA ITALY UNIV BONN,INST PHYS D-53115 BONN GERMANY UNIV CALIF RIVERSIDE,DEPT PHYS RIVERSIDE CA 92521 UNIV CAMBRIDGE,CAVENDISH LAB CAMBRIDGE CB3 0HE ENGLAND CARLETON UNIV,DEPT PHYS OTTAWA ON K1S 5B6 CANADA CARLETON UNIV,PARTICLE PHYS RES CTR OTTAWA ON K1S 5B6 CANADA CERN,EUROPEAN ORG PARTICLE PHYS CH-1211 GENEVA 23 SWITZERLAND UNIV CHICAGO,ENRICO FERMI INST CHICAGO IL 60637 UNIV CHICAGO,DEPT PHYS CHICAGO IL 60637 UNIV FREIBURG,FAK PHYS D-79104 FREIBURG GERMANY UNIV HEIDELBERG,INST PHYS D-69120 HEIDELBERG GERMANY INDIANA UNIV,DEPT PHYS BLOOMINGTON IN 47405 UNIV LONDON QUEEN MARY & WESTFIELD COLL LONDON E1 4NS ENGLAND RHEIN WESTFAL TH AACHEN,INST PHYS 3 D-52056 AACHEN GERMANY UNIV LONDON UNIV COLL LONDON WC1E 6BT ENGLAND UNIV MANCHESTER,SCHUSTER LAB,DEPT PHYS MANCHESTER M13 9PL LANCS ENGLAND UNIV MARYLAND,DEPT PHYS COLLEGE PK MD 20742 UNIV MONTREAL,PHYS NUCL LAB MONTREAL PQ H3C 3J7 CANADA UNIV OREGON,DEPT PHYS EUGENE OR 97403 RUTHERFORD APPLETON LAB DIDCOT OX11 0QX OXON ENGLAND CTR ETUD SACLAY,SPP,DAPNIA,CEA F-91191 GIF SUR YVETTE FRANCE TECHNION ISRAEL INST TECHNOL,DEPT PHYS IL-32000 HAIFA ISRAEL TEL AVIV UNIV,DEPT PHYS & ASTRON IL-69978 TEL AVIV ISRAEL UNIV TOKYO,INT CTR ELEMENTARY PARTICLE PHYS TOKYO 113 JAPAN UNIV TOKYO,DEPT PHYS TOKYO 113 JAPAN KOBE UNIV KOBE 657 JAPAN BRUNEL UNIV UXBRIDGE UB8 3PH MIDDX ENGLAND WEIZMANN INST SCI,DEPT PARTICLE PHYS IL-76100 REHOVOT ISRAEL UNIV HAMBURG,DESY,INST EXPTL PHYS 2 D-22607 HAMBURG GERMANY UNIV VICTORIA,DEPT PHYS VICTORIA BC V8W 3P6 CANADA UNIV BRITISH COLUMBIA,DEPT PHYS VANCOUVER BC V6T 1Z1 CANADA UNIV ALBERTA,DEPT PHYS EDMONTON AB T6G 2J1 CANADA DUKE UNIV,DEPT PHYS DURHAM NC 27708 TRIUMF VANCOUVER BC V6T 2A3 CANADA
Titolo Testata:
Zeitschrift fur Physik. C, Particles and fields
fascicolo: 2, volume: 68, anno: 1995,
pagine: 179 - 201
SICI:
0170-9739(1995)68:2<179:AMMOQA>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTICLE MULTIPLICITY RATIOS; HEAVY FLAVOR PRODUCTION; LUND MONTE-CARLO; E+E ANNIHILATION; OPAL EXPERIMENT; ROOT-S; FRAGMENTATION PROPERTIES; SIMULATION PROGRAM; 3-JET EVENTS; LEP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
61
Recensione:
Indirizzi per estratti:
Citazione:
R. Akers et al., "A MODEL-INDEPENDENT MEASUREMENT OF QUARK AND GLUON JET PROPERTIES ANDDIFFERENCES", Zeitschrift fur Physik. C, Particles and fields, 68(2), 1995, pp. 179-201

Abstract

Three jet events are selected from hadronic Z(0) decays with a symmetry such that the two lower energy jets are produced with the same energy and in the same jet environment. In some of the events, a displacedsecondary vertex is reconstructed in one of the two lower energy jets, which permits the other lower energy jet to be identified as a gluonjet, with an estimated purity of about 93%. Comparing these gluon jets to the inclusive sample of lower energy jets from the symmetric dataset yields direct, model independent measurements of quark and gluon jet properties, which have essentially no bias except from the jet definition. Results are reported using both the k(perpendicular to) and cone jet definitions. For the k(perpendicular to) algorithm, we find [n(k perpendicular to)(ch.)]gluon/[n(k perpendicular to)(ch.)]quark = 1.25 +/- 002(stat.) +/- 0.03(syst.) for the ratio of the mean charged particle multiplicity of gluon to quark jets, while for the cone algorithm, we find [n(cone)(ch.)]gluon/[n(cone)(ch.)]quark = 1.10 +/- 0.02(stat.) +/- 0.02(syst.)using a cone size of 30 degrees. We also report measurements of the angular distributions of particle energy and multiplicity around the jet directions, and of the fragmentation functions ofthe jets. Gluon jets are found to be substantially broader and to have a markedly softer fragmentation function than quark jets, in agreement with our earlier observations.

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Documento generato il 05/12/20 alle ore 06:11:26