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Search for promptly produced heavy quarkonium states in hadronic Z decays

  • P. Abreu
  • , W. Adam
  • , T. Adye
  • , E. Agasi
  • , I. Ajinenko
  • , R. Aleksan
  • , G. D. Alekseev
  • , P. P. Allport
  • , S. Almehed
  • , S. J. Alvsvaag
  • , 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, G. Barbiellini, D. Y. Bardin, G. J. Barker, 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, K. Belous, A. C. Benvenuti, M. Berggren, D. Bertrand, F. Bianchi, M. Bigi, M. S. Bilenky, P. Billoir, D. Bloch, M. Blume, S. Blyth, V. Bocci, T. Bolognese, M. Bonesini, W. Bonivento, P. S.L. Booth, G. Borisov, C. Bosio, S. Bosworth, O. Botner, B. Bouquet, C. Bourdarios, T. J.V. Bowcock, M. Bozzo, P. Branchini, K. D. Brand, T. Brenke, R. A. Brenner, C. Bricman, L. Brillault, R. C.A. Brown, P. Bruckman, J. M. Brunet, L. Bugge, T. Buran, T. Burgsmueller, P. Buschmann, A. Buys, M. Caccia, M. Calvi, A. J. Camacho Rozas, T. Camporesi, V. Canale, M. Canepa, K. Cankocak, F. Cao, F. Carena, P. Carrilho, L. Carroll, C. Caso, M. V. Castillo Gimenez, A. Cattai, F. R. Cavallo, L. Cerrito, V. Chabaud, Ph Charpentier, L. Chaussard, J. Chauveau, P. Checchia, G. A. Chelkov, R. Chierici, P. Chliapnikov, P. Chochula, V. Chorowicz, 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, H. De Boeck, 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, Y. Dufour, F. Dupont, D. Edsall, R. Ehret, G. Eigen, T. Ekelof, G. Ekspong, M. Elsing, J. P. Engel, N. Ershaidat, B. Erzen, M. Espirito Santo, E. Falk, D. Fassouliotis, M. Feindt, A. Ferrer, 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. Gokieli, 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, Z. Hajduk, 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, 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, B. A. Khomenko, N. N. Khovanski, B. King, N. J. Kjaer, H. Klein, A. Klovning, P. 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Redaelli, M. Regler, D. Reid, P. B. Renton, L. K. Resvanis, F. Richard, J. Richardson, J. Ridky, G. Rinaudo, I. Ripp, A. Romero, I. Roncagliolo, P. Ronchese, L. Roos, E. I. Rosenberg, E. Rosso, P. Roudeau, T. Rovelli, W. Ruckstuhl, V. Ruhlmann-Kleider, A. Ruiz, H. Saarikko, Y. Sacquin, A. Sadovsky, G. Sajot, J. Salt, J. Sanchez, M. Sannino, M. Schimmelpfennig, H. Schneider, U. Schwickerath, M. A.E. Schyns, G. Sciolla, F. Scuri, P. Seager, Y. Sedykh, A. M. Segar, A. Seitz, R. Sekulin, R. C. Shellard, I. Siccama, P. Siegrist, S. Simonetti, F. Simonetto, A. N. Sisakian, B. Sitar, T. B. Skaali, G. Smadja, N. Smirnov, O. Smirnova, G. R. Smith, R. Sosnowski, D. Souza-Santos, T. Spassov, E. Spiriti, P. Sponholz, S. Squarcia, C. Stanescu, S. Stapnes, I. Stavitski, F. Stichelbaut, A. Stocchi, J. Strauss, R. Strub, B. Stugu, M. Szczekowski, M. Szeptycka, T. Tabarelli, J. P. Tavernet, O. Tchikilev, A. Tilquin, J. Timmermans, L. G. Tkatchev, T. Todorov, D. Z. Toet, A. Tomaradze, B. Tome, L. 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  • Faculdade de Ciências, Universidade de Lisboa
  • Institut für Hochenergiephysik
  • CCLRC Rutherford Appleton Laboratory
  • Science Park 105
  • Kurchatov Institute
  • Centre d'Etudes de Saclay
  • Institut Pierre Simon Laplace, CNRS and CEA
  • Dubna
  • Joint Institute for Nuclear Research, Dubna
  • Department of Physics
  • University of Liverpool
  • Department of Physics
  • Lund University
  • Department of Physics
  • University of Bergen
  • European Organization for Nuclear Research
  • Univ. Federal do Rio de Janeiro
  • Instituto de Biofisica da UFRJ
  • Dipartimento di Fisica
  • University of Milano
  • Université Paris-Sud
  • Institut für Experimentelle Kernphysik
  • Universität Karlsruhe/Forschungszentrum Karlsruhe
  • Stockholm University
  • Université Paris-Saclay
  • Dipartimento di Fisica
  • University of Trieste
  • Istituto di Fisica
  • and Physics University of Udine
  • Department of Physics
  • University of Oxford
  • Sezione di Roma
  • Complutense University
  • Research Institute for High Energy Physics
  • Helsinki Institute of Physics
  • Universités Paris VI and VII
  • Fachbereich Physik
  • Bergische Universität Gesamthochschule Wuppertal
  • Centro Brasileiro de Pesquisas Fisicas
  • Depto. de Fisica
  • Pontifícia Universidade Católica do Rio de Janeiro
  • Inst. de Fisica
  • Rua São Francisco de Xavier
  • College de France
  • University of Bologna
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  • University of Antwerp
  • Inter-University Institute for High Energies ULB-VUB
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  • University of Rome “Tor Vergata”
  • Department of Radiation Sciences
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  • University of Genoa
  • Dipartimento di Fisica
  • University of Padova
  • Agh University of Science and Technology Faculty of Computer Science
  • Department of Physics
  • University of Oslo
  • Instituto de Fisica de Cantabria (CSIC-UC)
  • University of Valencia
  • IGFL, Université de Lyon, Université Lyon 1
  • Faculty of Mathematics and Physics
  • Comenius University
  • J. Stefan Institute and Department of Physics
  • University of Ljubljana
  • Ames Laboratory
  • Dpto. Fisica
  • University of Oviedo
  • Niels Bohr Institutet
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  • University of Warsaw
  • Physics Department
  • National Technical University of Athens
  • N.C.S.R. Demokritos
  • Physics Laboratory
  • University of Athens
  • NC
  • Charles University
  • Institute of Physics of the Czech Academy of Sciences
  • School of Physics and Materials
  • Lancaster University
  • Institute of Nuclear Physics Demokritos

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

A search has been made for direct production of heavy quarkonium states in more than 3 million hadronic Z 0 decays in the 1991-1994 DELPHI data. Prompt J/ψ, ψ(2 S) and Γ candidates have been searched for through their leptonic decay modes using criteria based on the kinematics and decay vertex positions. New upper limits are set at the 90% confidence level for Br(Z 0→(Qq)X)/Br(Z 0→ hadrons) for various strong production mechanisms of J/ψ and Γ; these range down to 0.9×10-4. The limits are set in the presence of a small excess (∼1% statistical probability of a background fluctuation) in the sum of candidates from prompt J/ψ, ψ(2 S), γ(1 S), γ(2 S) and γ(3 S) relative to the estimated background.

Original languageEnglish
Pages (from-to)575-583
Number of pages9
JournalZeitschrift für Physik C: Particles and Fields
Volume69
Issue number1
DOIs
Publication statusPublished - 1 Dec 1995
Externally publishedYes

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