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A MEASUREMENT OF THE AVERAGE BOTTOM HADRON LIFETIME

Authors

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 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 MASHIMO T MATTHEWS W MATTIG P MCDONALD WJ MCKENNA J MCKIGNEY EA MCMAHON TJ MARTINEZ G MCNAB AI MCPHERSON RA MEIJERS F MENKE S MERRITT 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 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

Citation

K. Ackerstaff et al., A MEASUREMENT OF THE AVERAGE BOTTOM HADRON LIFETIME, Zeitschrift fur Physik. C, Particles and fields, 73(3), 1997, pp. 397-408

Citations number

Categorie Soggetti

Physics, Particles & Fields

Journal title

Zeitschrift fur Physik. C, Particles and fields → ACNP

ISSN journal

01709739

Volume

Issue

Year of publication

1997

Pages

397 - 408

Database

ISI

SICI code

0170-9739(1997)73:3<397:AMOTAB>2.0.ZU;2-L

Abstract

The average b hadron Lifetime, tau(b) has been measured using approxim ately 3.5 million hadronic events collected with the OPAL detector at LEP between 1991 and 1994. A Lifetime tag based on a neural network al gorithm was used to select Z(0) --> b (b) over bar events. A secondary vertex reconstructed on the opposite side from the b-tag was used to measure the b hadron decay length. This was combined with an estimate of the b hadron momentum, allowing the b hadron decay time to be evalu ated. The lifetime, tau(b) = 1.611 +/- 0.010 (stat) +/- 0.027 (syst) p s, was extracted from a fit involving the distribution of the 95620 de cay times reconstructed in the data and the corresponding distribution in Monte Carlo.