Measurements with photonic events in e+e- collisions at centre-of-mass energies of 130-140 GeV

G. Alexanderw, N. Altekamp, K. Ametewee, 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, G. Beaudoin, J. Bechtluft, C. Beeston, T. Behnke, A. N. Bell, K. W. BellG. Bella, S. Bentvelsen, P. Berlich, S. Bethke, O. Biebel, V. Blobel, I. J. Bloodworth, J. E. Bloomer, P. Bock, H. M. Bosch, M. Boutemeur, B. T. Bouwens, S. Braibant, R. M. Brown, H. J. Burckhart, C. Burgard, R. Bürgin, P. Capiluppi, R. K. Carnegie, A. A. Carter, J. R. Carter, C. Y. Chang, C. Charlesworth, D. G. Charlton, D. Chrisman, S. L. Chu, P. E.L. Clarke, I. Cohen, J. E. Conboy, O. C. Cooke, M. Cuffiani, S. Dado, C. Dallapiccola, G. M. Dallavalle, C. Darling, S. de Jong, L. A. del Pozo, M. S. Dixit, E. do Couto e Silva, M. Doucet, E. Duchovni, G. Duckeck, I. P. Duerdoth, J. E.G. Edwards, P. G. Estabrooks, H. G. Evans, M. Evans, F. Fabbri, P. Fath, F. Fiedler, M. Fierro, H. M. Fischer, R. Folman, D. G. Fong, M. Foucher, H. Fukui, A. Fürtjes, P. Gagnon, A. Gaidot, J. W. Gary, J. Gascon, S. M. Gascon-Shotkin, 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, D. M. Gingrich, J. Goldberg, M. J. Goodrick, W. Gorn, C. Grandi, E. Gross, M. Gruwé, C. Hajdu, G. G. Hanson, M. Hansroul, M. Hapke, C. K. Hargrove, PA Hart, C. Hartmann, R. Hawkings, R. J. Hemingway, G. Ilerten, R. D. Heuer, M. D. Hildreth, J. C. Hill, S. J. Hillier, T. Hilse, PR Hobson, R. J. Homer, A. K. Honma, R. E. Hughes-Jones, D. E. Hutchcroft, P. Igo-Kemenes, D. C. Imrie, M. R. Ingram, A. Jawahery, P. W. Jeffreys, H. Jeremie, M. Jimack, A. Joly, G. Jones, M. Jones, R. W.L. Jones, J. Kanzaki, D. Karlen, T. Kawamoto, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, J. King, J. Kirk, S. Kluth, D. S. Koetke, T. P. Kokott, S. Komamiya, R. Kowalewski, T. Kress, P. Krieger, J. von Krogh, P. Kyberd, G. D. Lafferty, H. Lafoux, R. Lahmann, W. P. Lai, D. Lanske, J. Lauber, J. G. Layter, A. M. Lee, E. Lefebvre, D. Lellouch, J. Letts, L. Levinson, C. Lewis, S. L. Lloyd, F. K. Loebinger, G. D. Long, B. Lorazo, M. J. Losty, J. Ludwigj, A. Malik, M. Mannelli, S. Marcellini, C. Markus, A. J. Martin, J. P. Martin, G. Martinez, P. Mättig, W. J. McDonald, J. McKenna, E. A. Mckigney, T. J. McMahon, A. I. McNab, F. Meijers, S. Menke, F. S. Merritt, H. Mes, J. Meyer, A. Michelini, G. Mikenberg, D. J. Miller, R. Mir, W. Mohr, A. Montanari, U. Müller, B. Nellen, B. Nijjhar, R. Nisius, S. W. O'Neale, F. G. Oakham, F. Odorici, H. O. Ogren, J. Pálinkás, J. P. Pansart, G. Pásztor, M. J. Pearce, S. Petzold, J. E. Pilcher, J. Pinfold, D. E. Plane, P. Poffenberger, B. Poli, A. Posthaus, H. Przysiezniak, D. L. Rees, D. Rigby, M. G. Rison, S. A. Robins, N. Rodning, J. M. Roney, A. Rooke, E. Ros, A. M. Rossi, M. Rosvick, P. Routenburg, Y. Rozen, K. Runge, O. Runolfsson, D. R. Rust, R. Rylko, E. K.G. Sarkisyan, M. Sasaki, C. Sbarra, F. Scharf, P. Scharff-Hansen, P. Schenk, B. Schmitt, M. Schröder, H. C. Schultz-Coulon, M. Schulz, P. Schütz, J. Schwiening, W. G. Scott, T. G. Shears, B. C. Shen, C. H. Shepherd-Themistocleous, P. Sherwood, G. P. Siroli, A. Sitiler, A. Skillman, A. Skuja, A. M. Smith, T. J. Smith, G. A. Snow, R. Sobie, S. Söldner-Rembold, R. W. Springer, M. Sproston, A. Stahl, M. Starks, K. Stephens, J. Steuerer, B. Stockhausen, D. Strom, F. Strumia, P. Szymanski, R. Tafirout, H. Takeda, P. Taras, S. Tarem, M. Tecchio, N. Tesch, M. Thiergen, M. A. Thomson, E. von Törne, S. Towers, M. Tscheulin, E. Tsur, A. S. Turcot, M. F. Turner-Watson, P. Utzat, R. van Kooten, G. Vasseur, M. Verzocchi, P. Vikas, M. Vincter, E. H. Vokurka, F. Wäckerle, A. Wagner, C. P. Ward, D. R. Ward, J. J. Ward, P. M. Watkins, A. T. Watson, N. K. Watson, P. Weber, PS Wells, N. Werrnes, J. S. White, B. Wilkens, G. W. Wilson, J. A. Wilson, S. Wotton, T. R. Wyatt, S. Xella, S. Yamashita, G. Yekutieli, K. Yoshimura, V. Zacek

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17 Scopus citations

Abstract

Cross-sections and angular distributions for the production of events with single and multiple photons are measured from data recorded with the OPAL detector at the recently upgraded LEP collider. The measured cross-sections are generally consistent with Standard Model expectations for the e+e- → vv̄γ(γ) and e+e- → γγ(γ) processes. Six events with an acoplanar photon pair and large missing mass are found. The observed number of events is larger than expected from e+e- → vv̄γγ; however, the missing mass distribution is compatible with the Z0 resonance. Deviations from QED are constrained by the data on e+e- → γγ(γ). Lower limits are set at 95% confidence level on the QED cut-off parameters Λ+ and Λ- of 152 GeV and 142 GeV, respectively, and also on the mass of an excited electron of 147 GeV.

Original languageEnglish
Pages (from-to)222-234
Number of pages13
JournalPhysics Letters B
Volume377
Issue number1-3
DOIs
StatePublished - Jun 6 1996
Externally publishedYes

Funding

Forschung und Technologie, Germany, National Research Council of Canada, Hungarian Foundation for Scientific Research,O TKA T-01 6660, and OTKA F-015089. We particularly wish to thank the SL Division for the excellent start-up and performance of the LEP acceleratori n the data taking run at centre-of-mass energies of 130-140 GeV and for their continuing close cooperation with our experimental group. In addition to the support staff at our own institutions we are pleasedt o acknowledget he Departmento f Energy, USA, National Science Foundation, USA, Particle Physics and Astronomy Research Council. UK Natural Sciences and Engineering Research Council, Canada, Israel Ministry of Science, Israel Science Foundation, administeredb y the Israel Academy of Science and Humanities, Minerva Gesellschaft, Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science ResearchP rogram. German Israeli Bi-national Science Foundation (GIF), Direction des Sciences de la Matike du Commissariat a 1’Energie Atomique, France, Bundesministerium fur Bildung, Wissenschaft,

FundersFunder number
Hungarian Foundation for Scientific ResearchOTKA F-015089, O TKA T-01 6660
Israel Ministry of Science, Israel Science Foundation
Minerva Gesellschaft
Monbusho International Science ResearchP rogram
Natural Sciences and Engineering Research Council of Canada
National Research Council Canada
Ministry of Education, Culture, Sports, Science and Technology
Israel Academy of Sciences and Humanities

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