Determination of an upper limit for the mass of the τ-neutrino at LEP

R. Akers, G. Alexander,J. Allison,K. J. Anderson, S. Arcelli, S. Asai, A. Astbury, D. Axen, G. Azuelos, A. H. Ball, E. Barberio,R. J. Barlow, 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, S. Bentvelsen,P. Berlich, S. Bethke, O. Biebel,I. J. Bloodworth,P. Bock,H. M. Bosch, M. Boutemeur,S. Braibant, 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,C. Charlesworth,D. G. Charlton,S. L. Chu,P. E. L. Clarke,J. C. Clayton,S. G. Clowes, I. Cohen,J. E. Conboy, M. Coupland, M. Cuffiani,S. Dado, C. Dallapiccola, G. M. Dallavalle,C. Darling,S. De Jong,H. Deng, M. Dittmar,M. S. Dixit,E. do Couto e Silva,J. E. Duboscq, E. Duchovni, G. Duckeck, I. P. Duerdoth,U. C. Dunwoody,P. A. Elcombe, P. G. Estabrooks,E. Etzion,H. G. Evans,F. Fabbri,B. Fabbro,M. Fanti,M. Fierro,M. Fincke-Keeler,H. M. Fischer,P. Fischer,R. Folman,D. G. Fong,M. Foucher,H. Fukui,A. Fürtjes, P. Gagnon,A. Gaidot,J. W. Gary,J. Gascon,N. I. Geddes,C. Geich-Gimbel, S. W. Gensler,F. X. Gentit, T. Geralis, G. Giacomelli,P. Giacomelli,R. Giacomelli, V. Gibson,W. R. Gibson,J. D. Gillies,J. Goldberg,D. M. Gingrich,M. J. Goodrick,W. Gorn, C. Grandi, P. Grannis,E. Gross, J. Hagemann,G. G. Hanson,M. Hansroul,C. K. Hargrove, J. Hart,P. A. Hart, 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,P. R. Hobson,D. Hochman,A. Höcker,R. J. Homer, A. K. Honma,R. Howard,R. E. Hughes-Jones,R. Humbert,P. Igo-Kemenes,H. Ihssen,D. C. Imrie, 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,B. King,J. King,S. Kluth,T. Kobayashi,M. Kobel,D. S. Koetke, T. P. Kokott, S. Komamiya, R. Kowalewski,P. Krieger,J. von Krogh, P. Kyberd,G. D. Lafferty,H. Lafoux,R. Lahmann,I. Lauber,J. G. Layter,P. Leblanc,P. Le Du, A. M. Lee,E. Lefebvre,M. H. Lehto, D. Lellouch, C. Leroy, J. Letts,L. Levinson,Z. Li,F. Liu,S. L. Lloyd,F. K. Loebinger,G. D. Long,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,A. I. McNab,J. R. McNutt, F. Meijers, 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. Morii, U. Müller,B. Nellen,B. Nijjhar,S. W. O'Neale,F. G. Oakham, F. Odorici,H. O. Ogren,C. J. Oram,M. J. Oreglia,S. Orito, J. P. Pansart,G. N. Patrick,M. J. Pearce,P. Pfister,P. D. Phillips, J. E. Pilcher, J. Pinfold,D. Pitman,D. E. Plane,P. Poffenberger,B. Poli,A. Posthaus, T. W. Pritchard,H. Przysiezniak, M. W. Redmond, D. L. Rees, D. Rigby,M. Rison, S. A. Robins, D. Robinson,J. M. Roney,E. Ros,S. Rossberg,A. M. Rossi,M. Rosvick,P. Routenburg, Y. Rozen, K. Runge, O. Runolfsson,D. R. Rust,M. Sasaki, C. Sbarra,A. D. Schaile,O. Schaile,F. Scharf, P. Scharff-Hansen, P. Schenk,B. Schmitt,H. von der Schmitt,M. Schröder,H. C. Schultz-Coulon,P. Schütz,M. Schulz, 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,B. Stockhausen,R. Ströhmer,D. Strom,P. Szymanski,H. Takeda,T. Takeshita,S. Tarem,M. Tecchio, P. Teixeira-Dias,N. Tesch,M. A. Thomson,S. Towers, T. Tsukamoto,M. F. Turner-Watson,D. Van den plas,R. Van Kooten, G. Vasseur,M. Vincter, A. Wagner,D. L. Wagner, C. P. Ward, D. R. Ward,J. J. Ward, P. M. Watkins,A. T. Watson,N. K. Watson,P. Weber, P. S. Wells, N. Wermes, B. Wilkens,G. W. Wilson,J. A. Wilson,V. H. Winterer, T. Wlodek,G. Wolf,S. Wotton, T. R. Wyatt,A. Yeaman,G. Yekutieli,M. Yurko, W. Zeuner,G. T. Zorn

European Physical Journal C(1995)

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摘要
An upper limit for the?t mass is determined through the kinematic reconstruction of the decayt?5p±?t in the OPAL detector at LEP. The limit is obtained using a new method based on the comparison of the two-dimensional distribution of energy and invariant mass of the five-pion system with expectations from different neutrino mass hypotheses. From a sample of five events surviving the selection criteria we obtain an upper limit of 74 MeV at 95% confidence level. It is the first measurement at LEP energies, where the larger average multiplicity of 
$$e^ +  e^ -   \to q\bar q$$
events makes the suppression of this background more robust compared to lower energies.
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关键词
Lower Energy, Field Theory, Elementary Particle, Quantum Field Theory, Confidence Level
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