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Search for high mass γγ resonances in e+e - l+l-γγ, vv̄γγ and qq̄γγ at LEP I

  • P. Abreu
  • , W. Adam
  • , T. Adye
  • , E. Agasi
  • , I. Ajinenko
  • , R. Aleksan
  • , G. D. Alekseev
  • , R. Alemany
  • , P. P. Allport
  • , S. Almehed
  • , U. Amaldi
  • , S. Amato
  • , A. Andreazza
  • , M. L. Andrieux
  • , P. Antilogus
  • , W. D. Apel
  • , Y. Arnoud
  • , B. Åsman
  • , J. E. Augustin
  • , A. Augustinus
  • P. Baillon, P. Bambade, F. Barao, R. Barate, M. Barbi, D. Y. Bardin, A. Baroncelli, O. Barring, J. A. Barrio, W. Bartl, M. J. Bates, M. Battaglia, M. Baubillier, J. Baudot, K. H. Becks, M. Begalli, P. Beilliere, Yu Belokopytov, A. C. Benvenuti, M. Berggren, D. Bertini, D. Bertrand, F. Bianchi, M. Bigi, M. S. Bilenky, P. Billoir, D. Bloch, M. Blume, T. Bolognese, M. Bonesini, W. Bonivento, P. S.L. Booth, G. Borisov, C. Bosio, O. Botner, E. Boudinov, B. Bouquet, C. Bourdarios, T. J.V. Bowcock, M. Bozzo, P. Branchini, K. D. Brand, T. Brenke, R. A. Brenner, C. Bricman, R. C.A. Brown, P. Bruckman, J. M. Brunet, L. Bugge, T. Buran, T. Burgsmueller, P. Buschmann, A. Buys, S. Cabrera, M. Caccia, M. Calvi, A. J. Camacho Rozas, T. Camporesi, V. Canale, M. Canepa, K. Cankocak, F. Cao, F. Carena, L. Carroll, C. Caso, M. V. Castillo Gimenez, A. Cattai, F. R. Cavallo, V. Chabaud, Ph Charpentier, L. Chaussard, P. Checchia, G. A. Chelkov, M. Chen, R. Chierici, P. Chliapnikov, P. Chochula, V. Chorowicz, J. Chudoba, V. Cindro, P. Collins, J. L. Contreras, R. Contri, E. Cortina, G. Cosme, F. Cossutti, H. B. Crawley, D. Crennell, G. Crosetti, J. Cuevas Maestro, S. Czellar, E. Dahl-Jensen, J. Dahm, B. Dalmagne, M. Dam, G. Damgaard, P. D. Dauncey, M. Davenport, W. Da Silva, C. Defoix, A. Deghorain, G. Della Ricca, P. Delpierre, N. Demaria, A. De Angelis, W. De Boer, S. De Brabandere, C. De Clercq, C. De La Vaissiere, B. De Lotto, A. De Min, L. De Paula, C. De Saint-Jean, H. Dijkstra, L. Di Ciaccio, F. Djama, J. Dolbeau, M. Donszelmann, K. Doroba, M. Dracos, J. Drees, K. A. Drees, M. Dris, J. D. Durand, D. Edsall, R. Ehret, G. Eigen, T. Ekelof, G. Ekspong, M. Elsing, J. P. Engel, B. Erzen, M. Espirito Santo, E. Falk, D. Fassouliotis, M. Feindt, A. Fenyuk, A. Ferrer, S. Fichet, T. A. Filippas, A. Firestone, P. A. Fischer, H. Foeth, E. Fokitis, F. Fontanelli, F. Formenti, B. Franek, P. Frenkiel, D. C. Fries, A. G. Frodesen, R. Fruhwirth, F. Fulda-Quenzer, J. Fuster, A. Galloni, D. Gamba, M. Gandelman, C. Garcia, J. Garcia, C. Gaspar, U. Gasparini, Ph Gavillet, E. N. Gazis, D. Gele, J. P. Gerber, M. Gibbs, R. GokJeli, B. Golob, G. Gopal, L. Gorn, M. Gorski, Yu Gouz, V. Gracco, E. Graziani, G. Grosdidier, K. Grzelak, S. Gumenyuk, P. Gunnarsson, M. Gunther, J. Guy, F. Hahn, S. Hahn, A. Hallgren, K. Hamacher, W. Hao, F. J. Harris, V. Hedberg, R. Henriques, J. J. Hernandez, P. Herquet, H. Herr, T. L. Hessing, E. Higon, H. J. Hilke, T. S. Hill, S. O. Holmgren, P. J. Holt, D. Holthuizen, S. Hoorelbeke, M. Houlden, J. Hrubec, K. Huet, K. Hultqvist, J. N. Jackson, R. Jacobsson, P. Jalocha, R. Janik, Ch Jarlskog, G. Jarlskog, P. Jarry, B. Jean-Marie, E. K. Johansson, L. Jonsson, P. Jonsson, C. Joram, P. Juillot, M. Kaiser, F. Kapusta, K. Karafasoulis, M. Karlsson, E. Karvelas, S. Katsanevas, E. C. Katsoufis, R. Keranen, Yu Khokhlov, B. A. Khomenko, N. N. Khovanski, B. King, N. J. Kjaer, H. Klein, A. Klovning, P. Kluit, B. Koene, P. Kokkinias, M. Koratzinos, K. Korcyl, C. Kourkoumelis, O. Kouznetsov, P. H. Kramer, M. Krammer, C. Kreuter, I. Kronkvist, Z. Krumstein, W. Krupinski, P. Kubinec, W. Kucewicz, K. Kurvinen, C. Lacasta, I. Laktineh, J. W. Lamsa, L. Lanceri, D. W. Lane, P. Langefeld, I. Last, J. P. Laugier, R. Lauhakangas, G. Leder, F. Ledroit, V. Lefebure, C. K. Legan, R. Leitner, Y. Lemoigne, J. Lemonne, G. Lenzen, V. Lepeltier, T. Lesiak, J. Libby, D. Liko, R. Lindner, A. Lipniacka, I. Lippi, B. Loerstad, J. G. Loken, J. M. Lopez, D. Loukas, P. Lutz, L. Lyons, J. MacNaughton, G. Maehlum, A. Maio, T. G.M. Malmgren, V. Malychev, F. Mandl, J. Marco, R. Marco, B. Marechal, M. Margoni, J. C. Marin, C. Mariotti, A. Markou, T. Maron, C. Martinez-Rivero, F. Martinez-Vidal, S. Marti I Garcia, J. Masik, F. Matorras, C. Matteuzzi, G. Matthiae, M. Mazzucato, M. Mc Cubbin, R. Mc Kay, R. Mc Nulty, J. Medbo, M. Merk, C. Meroni, S. Meyer, W. T. Meyer, A. Miagkov, M. Michelotto, E. Migliore, L. Mirabito, W. A. Mitaroff, U. Mjoernmark, T. Moa, R. Moeller, K. Moenig, M. R. Monge, P. Morettini, H. Mueller, L. M. Mundim, W. J. Murray, B. Muryn, G. Myatt, F. Naraghi, F. L. Navarria, S. Navas, K. Nawrocki, P. Negri, W. Neumann, N. Neumeister, R. Nicolaidou, B. S. Nielsen, M. Nieuwenhuizen, V. Nikolaenko, P. Niss, A. Nomerotski, A. Normand, M. Novak, W. Oberschulte-Beckmann, V. Obraztsov, A. G. Olshevski, A. Onofre, R. Orava, K. Osterberg, A. Ouraou, P. Paganini, M. Paganoni, P. Pages, R. Pain, H. Palka, Th D. Papadopoulou, K. Papageorgiou, L. Pape, C. Parkes, F. Parodi, A. Passeri, M. Pegoraro, L. Peralta, M. Pernicka, A. Perrotta, C. Petridou, A. Petrolini, M. Petrovyck, H. T. Phillips, G. Piana, F. Pierre, M. Pimenta, S. Plaszczynski, O. Podobrin, M. E. Pol, G. Polok, P. Poropat, V. Pozdniakov, M. Prest, P. Privitera, N. Pukhaeva, A. Pullia, D. Radojicic, S. Ragazzi, H. Rahmani, P. N. Ratoff, A. L. Read, M. Reale, P. Rebecchi, N. G. Redaelli, M. Regler, D. Reid, P. B. Renton, L. K. Resvanis, F. Richard, J. Richardson, J. Ridky, G. Rinaudo
  • Instituto Superior Técnico
  • Institut für Hochenergiephysik
  • CCLRC Rutherford Appleton Laboratory
  • Science Park 105
  • Kurchatov Institute
  • CEA, Irfu, SPP
  • Joint Institute for Nuclear Research, Dubna
  • CSIC-UV - Instituto de Física Corpuscular (IFIC)
  • University of Liverpool
  • Lund University
  • European Organization for Nuclear Research
  • Instituto de Biofisica da UFRJ
  • University of Milano
  • Université Paris-Sud
  • Universität Karlsruhe/Forschungszentrum Karlsruhe
  • Stockholm University
  • IGFL, Université de Lyon, Université Lyon 1
  • Laboratoire de l'Accélérateur Linéaire
  • Sezione di Roma
  • Complutense University
  • Helsinki Institute of Physics
  • Universités Paris VI and VII
  • Bergische Universität Gesamthochschule Wuppertal
  • Centro Brasileiro de Pesquisas Fisicas
  • Collège de France
  • IHEP
  • University of Bologna
  • University of Antwerp
  • University of Turin
  • Uppsala University
  • University of Padova
  • Agh University of Science and Technology Faculty of Computer Science
  • University of Oslo
  • Instituto de Fisica de Cantabria (CSIC-UC)
  • Iowa State University
  • University of Rome “Tor Vergata”
  • University of Genoa
  • Comenius University
  • Charles University
  • University of Ljubljana
  • University of Trieste
  • University of Oviedo
  • Niels Bohr Institutet
  • Aix Marseille Université
  • University of Oxford
  • University of Warsaw
  • National Technical University of Athens
  • University of Bergen
  • Institute of Nuclear Physics Demokritos
  • University of Athens
  • Institute of Physics of the Czech Academy of Sciences
  • Lancaster University

Résultats de recherche: Contribution à un journalArticleRevue par des pairs

Résumé

A search for high mass photon pairs from the processes e+e - → l+l-γγ → qq̄γγ and e+e- → vv̄γγ with the DELPHI detector at LEP I is reported. From a data sample containing 3.5 million hadronic Z0 decays, collected by DELPHI during the years 1991 to 1994, 79 events with two charged leptons and two isolated photons were selected with photon pair masses above 10 GeV/c 2 , where 76 ± 6 events were predicted from standard sources. In the same data sample, no vv̄γγ candidates were found and no accumulation of events was visible for γγ masses above 10 GeV/c 2 in the qq̄γγ channel. Upper limits at 95% confidence level on the Z0 branching ratios for the three different channels were extracted from the data. In the mass region m γγ > 30 GeV/c2 the limits obtained are between 3 × 10-6and 4×10-6.

langue originaleAnglais
Pages (de - à)179-190
Nombre de pages12
journalZeitschrift fur Physik C-Particles and Fields
Volume72
Numéro de publication2
Les DOIs
étatPublié - 1 janv. 1996
Modification externeOui

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