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Titolo:
AN IMPROVED MEASUREMENT OF R-B USING A DOUBLE TAGGING METHOD
Autore:
ACKERSTAFF K; 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; BECHTLUFT J; BEESTON C; BEHNKE T; BELL AN; BELL KW; BELLA G; BENTVELSEN S; BERLICH P; BETHKE S; BIEBEL O; BIGUZZI A; BLOBEL V; BLOODWORTH IJ; BLOOMER JE; BOBINSKI M; BOCK P; BOSCH HM; BOUTEMEUR M; BOUWENS BT; BRAIBANT S; BROWN RM; BURCKHART HJ; BURGARD C; BURGIN R; CAPILUPPI P; CARNEGIE RK; CARTER AA; CARTER JR; CHANG CY; CHARLTON DG; CHRISMAN D; CLARKE PEL; COHEN I; CONBOY JE; COOKE OC; CUFFIANI M; DADO S; DALLAPICCOLA C; DALLAVALLE GM; DEJONG S; DELPOZO LA; DESCH K; DIXIT MS; SILVA EDE; DOUCET M; DUCHOVNI E; DUCKECK G; DUERDOTH IP; EDWARDS JEG; ESTABROOKS PG; EVANS HG; EVANS M; FABBRI F; FATH P; FIEDLER F; FIERRO M; FISCHER HM; FOLMAN R; FONG DG; FOUCHER M; FURTJES A; GAGNON P; GAIDOT A; GARY JW; GASCON J; GASCONSHOTKIN SM; GEDDES NI; GEICHGIMBEL C; GENTIT FX; GERALIS T; GIACOMELLI G; GIACOMELLI P; GIACOMELLI R; GIBSON V; GIBSON WR; GINGRICH DM; GLENZINSKI D; GOLDBERG J; GOODRICK MJ; GORN W; GRANDI C; GROSS E; GRUNHAUS J; GRUWE M; HAJDU C; HANSON GG; HANSROUL M; HAPKE M; HARGROVE CK; HART PA; HARTMANN C; HAUSCHILD M; HAWKES CM; HAWKINGS R; HEMINGWAY RJ; HERNDON M; HERTEN G; HEUER RD; HILDRETH MD; HILL JC; HILLIER SJ; HILSE T; HOBSON PR; HOMER RJ; HONMA AK; HORVATH D; HOWARD R; HUGHESJONES RE; HUTCHCROFT DE; IGOKEMENES P; IMRIE DC; INGRAM MR; ISHII K; JAWAHERY A; JEFFREYS PW; JEREMIE H; JIMACK M; JOLY A; JONES CR; JONES G; JONES M; JONES RWL; JOST U; JOVANOVIC P; JUNK TR; KARLEN D; KAWAGOE K; KAWAMOTO T; KEELER RK; KELLOGG RG; KENNEDY BW; KING BJ; KIRK J; KLUTH S; KOBAYASHI T; KOBEL M; KOETKE DS; KOKOTT TP; KOLREP M; KOMAMIYA S; KRESS T; KRIEGER P; VONKROGH J; KYBERD P; LAFFERTY GD; LAFOUX H; LAHMANN R; LAI WP; LANSKE D; LAUBER J; LAUTENSCHLAGER SR; LAYTER JG; LAZIC D; LEE AM; LEFEBVRE E; LELLOUCH D; LETTS J; LEVINSON L; LEWIS C; LLOYD SL; LOEBINGER FK; LONG GD; LOSTY MJ; LUDWIG J; MALIK A; MANNELLI M; MARCELLINI S; MARKUS C; MARTIN AJ; MARTIN JP; MARTINEZ G; MASHIMO T; MATTHEWS W; MATTIG P; MCDONALD WJ; MCKENNA J; MCKIGNEY EA; MCMAHON TJ; MCNAB AI; MCPHERSON RA; MEIJERS F; MENKE S; MERRIT FS; MES H; MEYER J; MICHELINI A; MIKENBERG G; MILLER DJ; MIR R; MOHR W; MONTANARI A; MORI T; MORII M; MULLER U; NAGAI K; NAKAMURA I; NEAL HA; NELLEN B; NIJJHAR B; NISIUS R; ONEALE SW; OAKHAM FG; ODORICI F; OGREN HO; OLDERSHAW NJ; OMORI T; OREGLIA MJ; ORITO S; PALINKAS J; PASZTOR G; PATER JR; PATRICK GN; PATT J; PEARCE MJ; PETZOLD S; PFEIFENSCHNEIDER P; PILCHER JE; PINFOLD J; PLANE DE; POFFENBERGER P; POLI B; POSTHAUS A; PRZYSIEZNIAK H; REES DL; RIGBY D; ROBERTSON S; ROBINS SA; RODNING N; RONEY JM; ROOKE A; ROS E; ROSSI AM; ROSVICK M; ROUTENBURG P; ROZEN Y; RUNGE K; RUNOLFSSON O; RUPPEL U; RUST DR; RYLKO R; SACHS K; SARKISYAN EKG; SASAKI M; SBARRA C; SCHAILE AD; SCHAILE O; SCHARF F; SCHARFFHANSEN P; SCHENK P; SCHMITT B; SCHMITT S; SCHRODER M; SCHULTZCOULON HC; SCHULZ M; SCHUMACHER M; SCHUTZ P; SCOTT WG; SHEARS TG; SHEN BC; SHEPHERDTHEMISTOCLEOUS CH; SHERWOOD P; SIROLI GP; SITTLER A; SKILLMAN A; SKUJA A; SMITH AM; SMITH TJ; SNOW GA; SOBIE R; SOLDNERREMBOLD S; SPRINGER RW; SPROSTON M; STAHL A; STEIERT M; STEPHENS K; STEUERER J; STOCKHAUSEN B; STROM D; STRUMIA F; SZYMANSKI P; TAFIROUT R; TALBOT SD; TANAKA S; TARAS P; TAREM S; THIERGEN M; THOMSON MA; VONTORNE E; TOWERS S; TRIGGER I; TSUKAMOTO T; TSUR E; TURCOT AS; TURNERWATSON MF; UTZAT P; VANKOOTEN R; VASSEUR G; VERZOCCHI M; VIKAS P; VINCTER M; VOKURKA EH; WACKERLE F; WAGNER A; WARD CP; WARD DR; WARD JJ; WATKINS PM; WATSON AT; WATSON NK; WELLS PS; WERMES N; WHITE JS; WILKENS B; WILSON GW; WILSON JA; WOLF G; WOTTON S; WYATT TR; YAMASHITA S; YEKUTIELI G; ZACEK V;
Indirizzi:
CERN,EUROPEAN ORG PARTICLE PHYS CH-1211 GENEVA 23 SWITZERLAND UNIV BIRMINGHAM,SCH PHYS & SPACE RES BIRMINGHAM B15 2TT W MIDLANDS ENGLAND UNIV BOLOGNA,DIPARTIMENTO FIS 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 CARLETON INST PHYS OTTAWA ON K1S 5B6 CANADA CARLETON UNIV,CTR RES PARTICLE PHYS OTTAWA ON K1S 5B6 CANADA 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,UNIV LONDON QUEEN MARY & WESTFIELD COLL LONDON E1 4NS ENGLAND RHEIN WESTFAL TH AACHEN,INST PHYS 2 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 CENS,CEA,SPP,DAPNIA 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 HYOGO 657 JAPAN BRUNEL UNIV UXBRIDGE UB8 3PH MIDDX ENGLAND WEIZMANN INST SCI,DEPT PARTICLE PHYS IL-76100 REHOVOT ISRAEL UNIV HAMBURG,DESY,INST EXPT PHYS 2 D-22607 HAMBURG GERMANY UNIV VICTORIA,DEPT PHYS VICTORIA BC V8W 3P6 CANADA UNIV ALBERTA,DEPT PHYS EDMONTON AB T6G 2J1 CANADA DUKE UNIV,DEPT PHYS DURHAM NC 27708 RES INST PARTICLE & NUCL PHYS H-1525 BUDAPEST HUNGARY INST NUCL RES H-4001 DEBRECEN HUNGARY UNIV MUNICH,SEKT PHYS D-85748 GARCHING GERMANY
Titolo Testata:
Zeitschrift fur Physik. C, Particles and fields
fascicolo: 1, volume: 74, anno: 1997,
pagine: 1 - 17
SICI:
0170-9739(1997)74:1<1:AIMORU>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEMILEPTONIC BRANCHING RATIOS; PROMPT ELECTRON PRODUCTION; HADRONIC Z(0) DECAYS; OPAL JET CHAMBER; E+E ANNIHILATION; MICROVERTEX DETECTOR; QUARK FRAGMENTATION; HEAVY QUARKS; TOP-QUARK; MESONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
50
Recensione:
Indirizzi per estratti:
Citazione:
K. Ackerstaff et al., "AN IMPROVED MEASUREMENT OF R-B USING A DOUBLE TAGGING METHOD", Zeitschrift fur Physik. C, Particles and fields, 74(1), 1997, pp. 1-17

Abstract

This paper describes an update of the double tagging measurement of the fraction, R-b, of Z(0) --> <b(b)over bar> events in hadronic Z(0) decays, with statistics improved by including the data collected in 1994. The presence of electrons or muons from semileptonic decays of bottom hadrons and the detection of bottom hadron decay vertices were usedtogether to obtain an event sample enriched in Z(0) --> <b(b)over bar> decays. The efficiency of the <b(b)over bar> event tagging was obtained from the data by comparing the numbers of events having a bottom signature in either one or both thrust hemispheres. Efficiency correlations between opposite event hemispheres are small (< 0.5%) and well understood through comparisons between the real and simulated data samples. A value of R-b = 0.2175 +/- 0.0014 +/- 0.0017 was obtained, where the first error is statistical and the second systematic. The uncertainty on the decay width Gamma(Z(0) --> <c(c)over bar>) is not included in these errors. The result depends on R-c as follows: Delta R-b/R-b =-0.084 Delta R-c/R-c, where Delta R-c is the deviation of R-c from the value 0.172 predicted by the Standard Model.

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Documento generato il 05/12/20 alle ore 14:09:18