A study of muon pair production and evidence for tau pair production in photon-photon collisions at LEP

R. Akers, G. Alexander,J. Allison,K. J. Anderson, S. Arcelli, A. Astbury, D. Axen,G. Azuelos,J. T. M. Baines, A. H. Ball,J. Banks,R. J. Barlow,S. Barnett, R. Bartoldus, J. R. Batley,G. Beaudoin, A. Beck,G. A. Beck,J. Becker, C. Beeston,T. Behnke, K. W. Bell,G. Bella,P. Bentkowski,P. Berlich, S. Bethke, O. Biebel,I. J. Bloodworth,P. Bock,B. Boden,H. M. Bosch, M. Boutemeur,H. Breuker, P. Bright-Thomas,R. M. Brown,A. Buijs, H. J. Burckhart,C. Burgard, P. Capiluppi, R. K. Carnegie, A. A. Carter,J. R. Carter,C. Y. Chang,D. G. Charlton,S. L. Chu,P. E. L. Clarke,J. C. Clayton, I. Cohen,J. E. Conboy, M. Cooper,M. Coupland, M. Cuffiani,S. Dado, G. M. Dallavalle,S. De Jong,L. A. del Pozo,H. Deng,A. Dieckmann, M. Dittmar,M. S. Dixit,E. do Couto e Silva,J. E. Duboscq, E. Duchovni, G. Duckeck, I. P. Duerdoth, D. J. P. Dumas,P. A. Elcombe,P. G. Estabrooks,E. Etzion,H. G. Evans,F. Fabbri,B. Fabbro,M. Fierro,M. Fincke-Keeler,H. M. Fischer,D. G. Fong,M. Foucher,A. Gaidot,J. W. Gary,J. Gascon,N. I. Geddes,C. Geich-Gimbel, S. W. Gensler,F. X. Gentit, G. Giacomelli,R. Giacomelli, V. Gibson,W. R. Gibson,J. D. Gillies,J. Goldberg,D. M. Gingrich,M. J. Goodrick,W. Gorn,C. Grandi,F. C. Grant, J. Hagemann,G. G. Hanson,M. Hansroul,C. K. Hargrove,P. F. Harrison,J. Hart,P. M. Hattersley,M. Hauschild, C. M. Hawkes,E. Heflin,R. J. Hemingway, G. Herten, R. D. Heuer,J. C. Hill, S. J. Hillier,T. Hilse,D. A. Hinshaw,J. D. Hobbs,P. R. Hobson,D. Hochman,R. J. Homer,A. K. Honma,R. E. Hughes-Jones,R. Humbert,P. Igo-Kemenes,H. Ihssen,D. C. Imrie, A. C. Janissen, A. Jawahery,P. W. Jeffreys,H. Jeremie,M. Jimack,M. Jones,R. W. L. Jones, P. Jovanovic,C. Jui,D. Karlen,K. Kawagoe,T. Kawamoto,R. K. Keeler,R. G. Kellogg, B. W. Kennedy,J. King,S. Kluth,T. Kobayashi,D. S. Koetke, T. P. Kokott, S. Komamiya,J. F. Kral, R. Kowalewski,J. von Krogh, J. Kroll,P. Kyberd,G. D. Lafferty,H. Lafoux,R. Lahmann,J. Lauber,J. G. Layter,P. Leblanc,A. M. Lee,E. Lefebvre,M. H. Lehto, D. Lellouch, C. Leroy, J. Letts,L. Levinson,S. L. Lloyd,F. K. Loebinger,J. M. Lorah,B. Lorazo, M. J. Losty,X. C. Lou, J. Ludwig,A. Luig, M. Mannelli, S. Marcellini,C. Markus,A. J. Martin,J. P. Martin, T. Mashimo,P. Mättig, U. Maur,J. McKenna,T. J. McMahon,J. R. McNutt, F. Meijers,D. Menszner, F. S. Merritt,H. Mes, A. Michelini,R. P. Middleton, G. Mikenberg,J. Mildenberger,D. J. Miller,R. Mir, W. Mohr,C. Moisan,A. Montanari,T. Mori, M. Mori, U. Müller,B. Nellen,H. H. Nguyen,S. W. O'Neale,F. G. Oakham, F. Odorici,H. O. Ogren,C. J. Oram,M. J. Oreglia,S. Orito,J. P. Pansart,B. Panzer-Steindel,P. Paschievici,G. N. Patrick,N. Paz-Jaoshvili,M. J. Pearce,P. Pfister, J. E. Pilcher, J. Pinfold,D. Pitman,D. E. Plane,P. Poffenberger,B. Poli, T. W. Pritchard,H. Przysiezniak, G. Quast, M. W. Redmond, D. L. Rees,G. E. Richards,M. Rison, S. A. Robins, D. Robinson,A. Rollnik,J. M. Roney,E. Ros,S. Rossberg,A. M. Rossi,M. Rosvick, P. Routenburg, K. Runge, O. Runolfsson,D. R. Rust,M. Sasaki,C. Sbarra,A. D. Schaile,O. Schaile,W. Schappert,F. Scharf, P. Scharff-Hansen,P. Schenk,B. Schmitt,H. von der Schmitt,M. Schröder, C. Schwick,J. Schwiening,W. G. Scott,M. Settles,T. G. Shears, B. C. Shen, C. H. Shepherd-Themistocleous, P. Sherwood, G. P. Siroli,A. Skillman, A. Skuja,A. M. Smith,T. J. Smith,G. A. Snow, R. Sobie,R. W. Springer,M. Sproston,A. Stahl,C. Stegmann,K. Stephens,J. Steuerer,R. Ströhmer,D. Strom,H. Takeda,T. Takeshita,S. Tarem,M. Tecchio, P. Teixeira-Dias,N. Tesch, M. A. Thomson,E. Torrente-Lujan,S. Towers,G. Transtromer,N. J. Tresilian, T. Tsukamoto,M. F. Turner,D. Van den plas,R. Van Kooten,G. J. VanDalen, G. Vasseur, A. Wagner,D. L. Wagner,C. Wahl, C. P. Ward, D. R. Ward,P. M. Watkins,A. T. Watson,N. K. Watson, M. Weber,P. Weber, P. S. Wells, N. Wermes,M. A. Whalley, B. Wilkens,G. W. Wilson,J. A. Wilson,V -H. Winterer, T. Wlodek,G. Wolf,S. Wotton, T. R. Wyatt,R. Yaari,A. Yeaman,G. Yekutieli,M. Yurko, W. Zeuner,G. T. Zorn,OPAL Collaboration

European Physical Journal C(1993)

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摘要
We have studied the reactions???µ+µ- and???t+t- by measuring the properties of events of the typese+e-?e+e-µ+µ- ande+e-?e+e-t+t- ate+e- centre-of-mass energies between 88 and 94 GeV. The data sample corresponds to an integratede+e- luminosity of 40.4 pb-1 collected by the OPAL detector at LEP. The QED structure functionF2 is extracted from a sample of 1462???µ+µ- events in which one photon is off the mass shell (single-tagged). TheQ2 range for these massive photons is 4–400 GeV2, with an averageQ2 of 8 GeV2. We have observed 48e+e-?e+e-µ+µ- events in which both final state electrons are detected. In the sample of single-tag events we have identified 34.9±6.7 events as due to the reaction?;?t+t-, on an estimated background of 5.1±2.7 events. In all cases the measured event distributions agree with QED calculations.
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关键词
Field Theory, Elementary Particle, Quantum Field Theory, State Electron, Pair Production
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