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Search for unstable heavy and excited leptons at LEP2

  • G. Abbiendi*
  • , K. Ackerstaff
  • , P. F. Akesson
  • , G. Alexander
  • , J. Allison
  • , K. J. Anderson
  • , S. Arcelli
  • , S. Asai
  • , S. F. Ashby
  • , D. Axen
  • , G. Azuelos
  • , I. Bailey
  • , A. H. Ball
  • , E. Barberio
  • , R. J. Barlow
  • , J. R. Batley
  • , S. Baumann
  • , T. Behnke
  • , K. W. Bell
  • , G. Bella
  • A. Bellerive, S. Bentvelsen, S. Bethke, S. Betts, O. Biebel, A. Biguzzi, I. J. Bloodworth, P. Bock, J. Böhme, O. Boeriu, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R. M. Brown, H. J. Burckhart, P. Capiluppi, R. K. Carnegie, A. A. Carter, J. R. Carter, C. Y. Chang, D. G. Charlton, D. Chrisman, C. Ciocca, P. E.L. Clarke, E. Clay, I. Cohen, J. E. Conboy, O. C. Cooke, J. Couchman, C. Couyoumtzelis, R. L. Coxe, M. Cuffiani, S. Dado, G. M. Dallavalle, S. Dallison, R. Davis, A. de Roeck, P. Dervan, K. Desch, B. Dienes, M. S. Dixit, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I. P. Duerdoth, P. G. Estabrooks, E. Etzion, F. Fabbri, A. Fanfani, M. Fanti, A. A. Faust, L. Feld, P. Ferrari, F. Fiedler, M. Fierro, I. Fleck, A. Frey, A. Fürtjes, D. I. Futyan, P. Gagnon, J. W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, D. M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, C. Hajdu, G. G. Hanson, M. Hansroul, M. Hapke, K. Harder, A. Harel, C. K. Hargrove, M. Harin-Dirac, M. Hauschild, C. M. Hawkes, R. Hawkings, R. J. Hemingway, G. Herten, R. D. Heuer, M. D. Hildreth, J. C. Hill, P. R. Hobson, A. Hocker, K. Hoffman, R. J. Homer, A. K. Honma, D. Horváth, K. R. Hossain, R. Howard, P. Huntemeyer, P. Igo-Kemenes, D. C. Imrie, K. Ishii, F. R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C. R. Jones, P. Jovanovic, T. R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P. I. Kayal, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, D. H. Kim, A. Klier, T. Kobayashi, M. Kobel, T. P. Kokott, M. Kolrep, S. Komamiya, R. V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, M. Kupper, P. Kyberd, G. D. Lafferty, H. Landsman, D. Lanske, J. Lauber, I. Lawson, J. G. Layter, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, J. Lillich, B. List, C. Littlewood, A. W. Lloyd, S. L. Lloyd, F. K. Loebinger, G. D. Long, M. J. Losty, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, T. E. Marchant, A. J. Martin, J. P. Martin, G. Martinez, T. Mashimo, P. Mättig, W. J. McDonald, J. McKenna, E. A. Mckigney, T. J. McMahon, R. A. McPherson, F. Meijers, P. Mendez-Lorenzo, F. S. Merritt, H. Mes, I. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D. J. Miller, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H. A. Neal, R. Nisius, S. W. O'Neale, F. G. Oakham, F. Odorici, H. O. Ogren, A. Okpara, M. J. Oreglia, S. Orito, G. Pásztor, J. R. Pater, G. N. Patrick, J. Patt, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J. E. Pilcher, J. Pinfold, D. E. Plane, B. Poli, J. Polok, M. Przybycień, A. Quadt, C. Rembser, H. Rick, S. A. Robins, N. Rodning, J. M. Roney, S. Rosati, K. Roscoe, A. M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D. R. Rust, K. Sachs, T. Saeki, O. Sahr, W. M. Sang, E. K.G. Sarkisyan, C. Sbarra, A. D. Schaile, O. Schaile, P. Scharff-Hansen, J. Schieck, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W. G. Scott, R. Seuster, T. G. Shears, B. C. Shen, C. H. Shepherd-Themistocleous, P. Sherwood, G. P. Siroli, A. Skuja, A. M. Smith, G. A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, R. Tafirout, S. D. Talbot, P. Taras, S. Tarem, R. Teuscher, M. Thiergen, J. Thomas, M. A. Thomson, E. Torrence, S. Towers, T. Trefzger, I. Trigger, Z. Trócsányi, E. Tsur, M. F. Turner-Watson, I. Ueda, R. Van Kooten, P. Vannerem, M. Verzocchi, H. Voss, F. Wäckerle, D. Waller, C. P. Ward, D. R. Ward, P. M. Watkins, A. T. Watson, N. K. Watson, P. S. Wells, T. Wengler, N. Wermes, D. Wetterling, J. S. White, G. W. Wilson, J. A. Wilson, T. R. Wyatt, S. Yamashita, V. Zacek, D. Zer-Zion
*Corresponding author for this work
  • University of Bologna
  • CERN
  • University of Bonn
  • University of Manchester
  • The University of Chicago
  • University of Maryland, College Park
  • The University of Tokyo
  • Kobe University
  • University of Birmingham
  • University of British Columbia
  • University of Montreal
  • TRIUMF
  • University of Victoria BC
  • University of Cambridge
  • University of Hamburg
  • Rutherford Appleton Laboratory
  • RWTH Aachen University
  • Max Planck Institute for Physics (Werner Heisenberg Institute)
  • University College London
  • Heidelberg University 
  • MPI Munchen
  • University of Freiburg
  • Ludwig Maximilian University of Munich
  • Carleton University
  • Queen Mary University of London
  • University of California at Riverside
  • Tel Aviv University
  • Technion-Israel Institute of Technology
  • University of Alberta
  • Institute for Nuclear Research
  • Weizmann Institute of Science
  • Indiana University Bloomington
  • Wigner Research Centre for Physics
  • Brunel University London
  • University of Oregon
  • Yale University
  • AGH University of Krakow
  • Laurentian University
  • University of Debrecen

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Searches for unstable neutral and charged heavy leptons, N and L±, and for excited states of neutral and charged leptons, v*, e*, μ*, and τ*, have been performed in e+e- collisions using data collected by the OPAL detector at LEP. The data analysed correspond to an integrated luminosity of about 58 pb-1 at a centre-of-mass energy of 183 GeV, and about 10 pb-1 each at 161 GeV and 172 GeV. No evidence for new particles was found. Lower limits on the masses of unstable heavy and excited leptons are derived. From the analysis of charged-current, neutral-current, and photonic decays of singly produced excited leptons. upper limits are determined for the ratio of the coupling to the compositeness scale, f/Λ, for masses up to the kinematic limit. For excited leptons, the limits are established independently of the relative values of the coupling constants f and f′.

Original languageEnglish
Pages (from-to)73-84
Number of pages12
JournalEuropean Physical Journal C
Volume14
Issue number1
DOIs
StatePublished - 2000

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