Measurement Of Gamma(Z(0)-]B(B)Over-Bar)/Gamma(Z(0)-]Hadrons) Using Leptons

Pd Acton,G Alexander,J Allison,Pp Allport,Kj Anderson,S Arcelli,A Astbury,D Axen,G Azuelos,Ga Bahan,Jtm Baines,Ah Ball,J Banks,Rj Barlow,S Barnett,Jr Batley,G Beaudoin,A Beck,Ga Beck,J Becker,T Behnke,Kw Bell,G Bella,P Bentkowski,P Berlich,S Bethke,O Biebel,U Binder,Ij Bloodworth,P Bock,B Boden,Hm Bosch,H Breuker,P Brightthomas,Rm Brown,A Buijs,Hj Burckhart,C Burgard,P Capiluppi,Rk Carnegie,Aa Carter,Jr Carter,Cy Chang,Dg Charlton,Sl Chu,Pel Clarke,I Cohen,Jc Clayton,Wj Collins,Je Conboy,M Cooper,M Coupland,M Cuffiani,S Dado,Gm Dallavalle,S Dejong,La Delpozo,H Deng,A Dieckmann,M Dittmar,Ms Dixit,Ede Silva,Je Duboscq,E Duchovni,G Duckeck,Ip Duerdoth,Djp Dumas,Pa Elcombe,Pg Estabrooks,E Etzion,Hg Evans,F Fabbri,M Fierro,M Finckekeeler,Hm Fischer,Dg Fong,M Foucher,A Gaidot,O Ganel,Jw Gary,J Gascon,Rf Mcgowan,Ni Geddes,C Geichgimbel,Sw Gensler,Fx Gentit,G Giacomelli,R Giacomelli,V Gibson,Wr Gibson,Jd Gillies,J Goldberg,Mj Goodrick,W Gorn,C Grandi,Fc Grant,J Hagemann,Gg Hanson,M Hansroul,Ck Hargrove,Pf Harrison,J Hart,Pm Hattersley,M Hauschild,Cm Hawkes,E Heflin,Rj Hemingway,Rd Heuer,Jc Hill,Sj Hillier,T Hilse,Da Hinshaw,Jd Hobbs,Pr Hobson,D Hochman,Rj Homer,Ak Honma,Re Hughesjones,R Humbert,P Igokemenes,H Ihssen,Dc Imrie,Ac Janissen,A Jawahery,Pw Jeffreys,H Jeremie,M Jimack,M Jobes,Rwl Jones,P Jovanovic,C Jui,D Karlen,K Kawagoe,T Kawamoto,Rk Keeler,Rg Kellogg,Bw Kennedy,S Kluth,T Kobayashi,Ds Koetke,Tp Kokott,S Komamiya,L Kopke,Jf Kral,R Kowalewski,J Vonkrogh,J Kroll,M Kuwano,P Kyberd,Gd Lafferty,R Lahmann,F Lamarche,Jg Layter,P Leblanc,Am Lee,Mh Lehto,D Lellouch,C Leroy,J Letts,S Levegrun,L Levinson,Sl Lloyd,Fk Loebinger,Jm Lorah,B Lorazo,Mj Losty,Xc Lou,J Ludwig,M Mannelli,S Marcellini,G Maringer,C Markus,Aj Martin,Jp Martin,T Mashimo,P Mattig,U Maur,J Mckenna,Tj Mcmahon,Jr Mcnutt,F Meijers,D Menszner,Fs Merritt,H Mes,A Michelini,Rp Middleton,G Mikenberg,J Mildenberger,Dj Miller,R Mir,W Mohr,C Moisan,A Montanari,T Mori,M Morii,T Mouthuy,B Nellen,Hh Nguyen,M Nozaki,Sw Oneale,Fg Oakham,F Odorici,Ho Ogren,Cj Oram,Mj Oreglia,S Orito,Jp Pansart,B Panzersteindel,P Paschievici,Gn Patrick,N Pazjaoshvili,P Pfister,Je Pilcher,J Pinfold,D Pitman,De Plane,P Poffenberger,B Poli,A Pouladdej,Tw Pritchard,H Przysiezniak,G Quast,Mw Redmond,Dl Rees,Ge Richards,D Robinson,A Rollnik,Jm Roney,E Ros,S Rossberg,Am Rossi,M Rosvick,P Routenburg,K Runge,O Runolfsson,Dr Rust,M Sasaki,C Sbarra,Ad Schaile,O Schaile,W Schappert,P Scharffhansen,P Schenk,B Schmitt,H Vonderschmitt,S Schreiber,C Schwick,J Schwiening,Wg Scott,M Settles,Tg Shears,Bc Shen,Ch Shepherdthemistocleous,P Sherwood,R Shypit,A Simon,P Singh,Gp Siroli,A Skuja,Am Smith,Tj Smith,Ga Snow,R Sobie,Rw Springer,M Sproston,K Stephens,J Steuerer,R Strohmer,D Strom,T Takeshita,P Taras,S Tarem,M Tecchio,P Teixeiradias,N Tesch,Nj Thackray,Ma Thomson,E Torrentelujan,G Transtromer,Nj Tresilian,T Tsukamoto,Mf Turner,G Tysarczykniemeyer,D Vandenplas,R Vankooten,Gj Vandalen,G Vasseur,Cj Virtue,A Wagner,Dl Wagner,C Wahl,Jp Walker,Cp Ward,Dr Ward,Pm Watkins,At Watson,Nk Watson,M Weber,P Weber,Ps Wells,N Wermes,Ma Whalley,Gw Wilson,Ja Wilson,Vh Winterer,T Wlodek,S Wotton,Tr Wyatt,R Yaari,A Yeaman,G Yekutieli,M Yurko,W Zeuner,Gt Zorn

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS（1993）

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Abstract

The fraction of bbBAR-events in hadronic Z0 decays has been measured from the yield of leptons in the data samples collected by OPAL in 1990 and 1991. A sample enriched in events containing Z0-->bbBAR decays was obtained by requiring the presence of an electron or muon with high momentum and high momentum component transverse to the associated hadronic jet. After accounting for backgrounds and acceptances, a value of GAMMA(Z0-->bbBAR)/GAMMA(Z0-->hadrons) = 0.220 +/- 0.002 +/- 0.006 +/- 0.011 was obtained. The first two errors reflect the data statistics and the systematic uncertainties arising from detector modelling uncertainties, respectively. The third error includes systematic effects from b and c fragmentation and decay uncertainties.

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