A measurement of electron production in hadronic Z ~ decays and a determination of F ( Z ~ OPAL Collaboration
P. D. Acton,G. Alexander,J. Allison,P. P. Allport,K. J. Anderson,S. Arcelli,P. Ashton,A. Astbury,D. Axen,G. A. Bahan,J. T. M. Baines,A. H. Ball,J. Banks,G. J. Barker,R. J. Barlow,A. Beck,T. Behnke,K. W. Bell,G. Bella,O. Biebel,U. Binder,P. Bock,B. Boden,S. Bougerolle,B. B. Brabson,R. M. Brown,H. J. Burckhart,P. Capiluppi,R. K. Carnegie,A. A. Carter,C. Y. Chang,P. E. L. Clarke,I. Cohen,W. J. Collins,M. Cooper,M. Couch,M. Coupland,M. Cuffiani,S. Dado,G. M. Dallavalle,S. De Jong,P. Debu,M. M. Deninno,A. Dieckmann,M. Di t tmar,M. S. Dixit,E. do Conto el Silva,E. Duchovni,G. Duckeck,I. P. Duerdo,D. J. P. Dumas,P. A. Elcombe,P. G. Estabrooks,E. Etzion,H. G. Evans,F. Fabbri,- M.Fincke,Keeler,H. M. Fischer,D. G. Fong,C. Fukunaga,A. Gaidot,O. Gane,J. W. Gary,N. I. Geddes,C. Geich-Gimbel,S. W. Gensler,F. X. Gentit,G. Giacomelli,W. R. Gibson,J. D. Gillies,W. Gorn,C. Grandi,F. C. Grant,J. Hagemann,G. G. Hanson,C. K. Hargrove,P. F. Harrison,P. M. Hattersley,E. Heflin,R. J. Hemingway,S. J. Hillier,D. A. Hinshaw,C. Ho,P. R. Hobson,D. Hochman,R. J. Homer,S. R. Hou,H. Ihssen,D. C. Imrie,A. C. Janissen,A. Jawahery,P. W. Jeffreys,M. Jimack,M. Jobes,R. W. L. Jones,D. Karlen,K. Kawagoe,T. Kawamoto,R. K. Keeler,R. G. Kellogg,B. W. Kennedy,D. E. Klem,T. Kobayashi,T. P. Kokot,S. Komamiya,R. Kowalewski,H. Kreutzmann,J. von Krogh,j. Kroll,M. Kuwano,P. Kyberd,G. D. Lafferty,W. J. Larson,J. G. Layter,P. Le Du,A. M. Lee,D. Lellouch,P. Lennert,J. Letts,S. Levegrfin,L. Levinson,S. L. Lloyd,F. K. Loebinger,J. M. Lorah,M. J. Losty,X. C. Lou,G. Maringer,U. Maur,J. McKenna,D. Menszner,F. S. Merrit,H. Mes,A. Michelini,R. P. Middleton,G. Mikenberg,J. Mildenberger,D. J. Miller,R. Mir,W. Mohr,A. Montanar,T. Mori,M. W. Moss,T. Mouthuy,B. Nellen,H. H. Nguyen,B. P. O'Neill,F. G. Oakham,F. Odirici,M. Ogg,H. O. Ogren,H. Oh,C. J. Oram,M. J. Oreglia,S. Orito,J. P. Pansart,P. Paschievici,G. N. Patrick,P. Poffenberger,B. Poli,A. Pouladdej,H. Przysiezniak,G. Quast,M. W. Redmond,D. L. Rees,K. Riles,S. A. Robins,A. Rollnik,J. M. Roney,S. Rossberg,P. Routenburg,D. R. Rust,S. Sanghera,M. Sasaki,A. D. Schaile,P. Schenk,S. Schreiber,J. Schwiening,W. G. Scott,B. C. Shen,P. Sherwood,R. Shypit,A. Simon,P. Singh,G. P. Siroli,A. Skuja,G. A. Snow,R. Sobie,D. Strom,H. Takeda,T. Takeshita,p. Taras,S. Tarem,P. Teixeira-Dias,G. Transt romer,T. Tsukamoto,G. Tysarczyk-Niemeyer,G. J. VanDalen,G. Vasseur,A. Wagner,D. L. Wagner,C. Wahl,J. P. Walker,A. T. Watson,P. Weber,P. S. Wells,G. W. Wilson,N. C. Wood,R. Yaari,Y. Yang,G. Yekutieli,M. Yurko,W. Zeuner,G. T. Zorn
semanticscholar（2019）
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摘要
The product ion rate o f electrons with momentum p > 4 G e V / c and large m o m e n t u m transverse to the jet containing the electron has been measured in 136 000 hadronic decays o f the Z ~ recorded with the O P A L detector at LEP in 1990. The dominan t source o f these electrons is the semileptonic decay of hadrons containing b quarks. I f we assume that the semileptonic branching fraction o f b hadrons produced on the Z ~ resonance is the same as the branching fraction measured at the r ( 4 S) resonance, we determine Fse = 394 + 13 + 32 MeV, where the first error is statistical and the second error is systematic. The sensitivity o f the result to this assumption is discussed. We have reduced the dependence o f our result on the model o f b hadron semileptonic decay by taking into account the correlat ion between the model dependence o f the branching fractions measured at the Y (4 S ) and of our kinematic acceptance for electrons.
