Tests of the Standard Model andConstraints on New Physics fromMeasurements of Fermion-pairProduction at 130 { 172 GeV at LEPThe OPAL
G. Alexander,J. Allison,N. Altekamp,K. J. Anderson,S. Anderson,S. Arcelli,S. Asai,D. Axen,G. Azuelos,A. H. Ball,E. Barberio,R. J. Barlow,R. Bartoldus,J. R. Batley,S. Baumann,J. Bechtluft,C. Beeston,T. Behnke,A. N. Bell,K. W. Bell,G. Bella,S. Bentvelsen,S. Bethke,O. Biebel,A. Biguzzi,S. D. Bird,V. Blobel,I. J. Bloodworth,J. E. Bloomer,M. Bobinski,P. Bock,D. Bonacorsi,M. Boutemeur,B. T. Bouwens,S. Braibant,L. Brigliadori,R. M. Brown,H. J. Burckhart,C. Burgard,P. Capiluppi,R. K. Carnegie,A. A. Carter,J. R. Carter,C. Y. Chang,D. G. Charlton,D. Chrisman,P. E. L. Clarke,I. Cohen,J. E. Conboy,O. C. Cooke,S. Dado,C. Dallapiccola,G. M. Dallavalle,R. Davis,S. De Jong,L. A. del Pozo,K. Desch,B. Dienes,M. S. Dixit,E. do Couto,eSilva,M. Doucet,E. Duchovni,G. Duckeck,I. P. Duerdoth,D. Eatough,J. E. G. Edwards,P. G. Estabrooks,H. G. Evans,M. Evans,F. Fabbri,M. Fanti,A. A. Faust,F. Fiedler,M. Fierro,H. M. Fischer,I. Fleck,R. Folman,D. G. Fong,M. Foucher,A. F urtjes,D. I. Futyan,P. Gagnon,J. W. Gary,J. Gascon,S. M. Gascon-Shotkin,N. I. Geddes,C. Geich-Gimbel,T. Geralis,G. Giacomelli,P. Giacomelli,R. Giacomelli,V. Gibson,W. R. Gibson,D. M. Gingrich,D. Glenzinski,J. Goldberg,M. J. Goodrick,W. Gorn,C. Grandi,E. Gross,J. Grunhaus,M. Gruw,C. Hajdu,G. G. Hanson,M. Hansroul,M. Hapke,C. K. Hargrove,P. A. Hart,C. Hartmann,M. Hauschild,C. M. Hawkes,R. Hawkings,R. J. Hemingway,M. Herndon,G. Herten,R. D. Heuer,M. D. Hildreth,J. C. Hill,S. J. Hillier,P. R. Hobson,R. J. Homer,A. K. Honma,D. Horv,K. R. Hossain,R. Howard,P. H untemeyer,D. E. Hutchcroft,P. Igo-Kemenes,D. C. Imrie,M. R. Ingram,K. Ishii,A. Jawahery,P. W. Je reys,H. Jeremie,M. Jimack,A. Joly,C. R. Jones,G. Jones,M. Jones,U. Jost,P. Jovanovic,T. R. Junk,D. Karlen,V. Kartvelishvili,K. Kawagoe,T. Kawamoto,P. I. Kayal,R. K. Keeler,R. G. Kellogg,B. W. Kennedy,J. Kirk,A. Klier,S. Kluth,T. Kobayashi,M. Kobel,D. S. Koetke,T. P. Kokott,M. Kolrep,S. Komamiya,T. Kress,P. Krieger,J. von Krogh,P. Kyberd,R. Lahmann,W. P. Lai,D. Lanske,J. Lauber,S. R. Lautenschlager,J. G. Layter,D. Lazic,A. M. Lee,E. Lefebvre,D. Lellouch,J. Letts,L. Levinson,S. L. Lloyd,F. K. Loebinger,G. D. Long,M. J. Losty,J. Ludwig,A. Macchiolo,A. Macpherson,M. Mannelli,S. Marcellini,C. Markus,A. J. Martin,J. P. Martin,G. Martinez,T. Mashimo,W. J. McDonald,J. McKenna,E. A. Mckigney,T. J. McMahon,R. A. McPherson,F. Meijers,S. Menke,F. S. Merritt,H. Mes,J. Meyer,A. Michelini,G. Mikenberg,D. J. Miller,A. Mincer,R. Mir,W. Mohr,A. Montanari,T. Mori,M. Morii,S. Mihara,K. Nagai,I. Nakamura,H. A. Neal,B. Nellen,R. Nisius,S. W. O'Neale,F. G. Oakham,F. Odorici,H. O. Ogren,A. Oh,N. J. Oldershaw,M. J. Oreglia,S. Orito,J. R. Pater,G. N. Patrick,J. Patt,M. J. Pearce,R. Perez-Ochoa,S. Petzold,P. Pfeifenschneider,J. E. Pilcher,J. Pinfold,D. E. Plane,P. Po enberger,B. Poli,A. Posthaus,D. L. Rees,D. Rigby,S. Robertson,S. A. Robins,N. Rodning,J. M. Roney,A. Rooke,E. Ros,A. M. Rossi,P. Routenburg,Y. Rozen,K. Runge,O. Runolfsson,U. Ruppel,D. R. Rust,R. Rylko,K. Sachs,T. Saeki,E. K. G. Sarkisyan,C. Sbarra,A. D. Schaile,O. Schaile,F. Scharf,P. Schar-Hansen,P. Schenk,J. Schieck,P. Schleper,B. Schmitt,S. Schmitt,M. Schumacher
semanticscholar（2007）
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摘要
Production of events with hadronic and leptonic nal states has been measured in e + e ? collisions at centre-of-mass energies of 130{172 GeV, using the OPAL detector at LEP. Cross-sections and leptonic forward-backward asymmetries are presented, both including and excluding the dominant production of radiative Z events, and compared to Standard Model expectations. The ratio R b of the cross-section for bb production to the hadronic cross-section has been measured. In a model-independent t to the Z lineshape, the data have been used to obtain an improved precision on the measurement of-Z interference. The energy dependence of em has been investigated. The measurements have also been used to obtain limits on extensions of the Standard Model described by eeective four-fermion contact interactions, to search for t-channel contributions from new massive particles and to place limits on chargino pair production with subsequent decay of the chargino into a light gluino and a quark pair.
