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Formation of the ηc in two-photon collisions at LEP

  • M. Acciarri
  • , P. Achard
  • , O. Adriani
  • , M. Aguilar-Benitez
  • , J. Alcaraz
  • , G. Alemanni
  • , J. Allaby
  • , A. Aloisio
  • , M. G. Alviggi
  • , G. Ambrosi
  • , H. Anderhub
  • , V. P. Andreev
  • , T. Angelescu
  • , F. Anselmo
  • , A. Arefiev
  • , T. Azemoon
  • , T. Aziz
  • , P. Bagnaia
  • , L. Baksay
  • , A. Balandras
  • R. C. Ball, S. Banerjee, S. Banerjee, A. Barczyk, R. Barillère, L. Barone, P. Bartalini, M. Basile, R. Battiston, A. Bay, F. Becattini, U. Becker, F. Behner, J. Berdugo, P. Berges, B. Bertucci, B. L. Betev, S. Bhattacharya, M. Biasini, A. Biland, J. J. Blaising, S. C. Blyth, G. J. Bobbink, A. Böhm, L. Boldizsar, B. Borgia, D. Bourilkov, M. Bourquin, S. Braccini, J. G. Branson, V. Brigljevic, F. Brochu, A. Buffini, A. Buijs, J. D. Burger, W. J. Burger, J. Busenitz, A. Button, X. D. Cai, M. Campanelli, M. Capell, G. Cara Romeo, G. Carlino, A. M. Cartacci, J. Casaus, G. Castellini, F. Cavallari, N. Cavallo, C. Cecchi, M. Cerrada, F. Cesaroni, M. Chamizo, Y. H. Chang, U. K. Chaturvedi, M. Chemarin, A. Chen, G. Chen, G. M. Chen, H. F. Chen, H. S. Chen, X. Chereau, G. Chiefari, L. Cifarelli, F. Cindolo, C. Civinini, I. Clare, R. Clare, G. Coignet, A. P. Colijn, N. Colino, S. Costantini, F. Cotorobai, B. Cozzoni, B. de la Cruz, A. Csilling, S. Cucciarelli, T. S. Dai, J. A. van Dalen, R. D'Alessandro, R. de Asmundis, P. Deglon, A. Degré, K. Deiters, D. della Volpe, P. Denes, F. DeNotaristefani, A. de Salvo, M. Diemoz, D. van Dierendonck, F. di Lodovico, C. Dionisi, M. Dittmar, A. Dominguez, A. Doria, M. T. Dova, D. Duchesneau, D. Dufournand, P. Duinker, I. Duran, H. El Mamouni, A. Engler, F. J. Eppling, F. C. Erné, P. Extermann, M. Fabre, R. Faccini, M. A. Falagan, S. Falciano, A. Favara, J. Fay, O. Fedin, M. Felcini, T. Ferguson, F. Ferroni, H. Fesefeldt, E. Fiandrini, J. H. Field, F. Filthaut, P. H. Fisher, I. Fisk, G. Forconi, L. Fredj, K. Freudenreich, C. Furetta, Y. Galaktionov, S. N. Ganguli, P. Garcia-Abia, M. Gataullin, S. S. Gau, S. Gentile, N. Gheordanescu, S. Giagu, Z. F. Gong, G. Grenier, O. Grimm, M. W. Gruenewald, R. van Gulik, V. K. Gupta, A. Gurtu, L. J. Gutay, D. Haas, A. Hasan, D. Hatzifotiadou, T. Hebbeker, A. Hervé, P. Hidas, J. Hirschfelder, H. Hofer, G. Holzner, H. Hoorani, S. R. Hou, I. Iashvili, B. N. Jin, L. W. Jones, P. de Jong, I. Josa-Mutuberría, R. A. Khan, D. Kamrad, M. Kaur, M. N. Kienzle-Focacci, D. Kim, D. H. Kim, J. K. Kim, S. C. Kim, J. Kirkby, D. Kiss, W. Kittel, A. Klimentov, A. C. König, A. Kopp, I. Korolko, V. Koutsenko, M. Kräber, R. W. Kraemer, W. Krenz, A. Kunin, P. Lacenter, P. Ladron de Guevara, I. Laktineh, G. Landi, K. Lassila-Perini, M. Lebeau, A. Lebedev, P. Lebrun, P. Lecomte, P. Lecoq, P. Le Coultre, H. J. Lee, J. M. Le Goff, R. Leiste, E. Leonardi, P. Levtchenko, C. Li, C. H. Lin, W. T. Lin, F. L. Linde, L. Lista, Z. A. Liu, W. Lohmann, E. Longo, Y. S. Lu, K. Lübelsmeyer, C. Luci, D. Luckey, L. Lugnier, L. Luminari, W. Lustermann, W. G. Ma, M. Maity, L. Malgeri, A. Malinin, C. Maña, D. Mangeol, P. Marchesini, G. Marian, J. P. Martin, F. Marzano, G. G.G. Massaro, K. Mazumdar, R. R. McNeil, S. Mele, L. Merola, M. Meschini, W. J. Metzger, M. von der Mey, G. Mirabelli, J. Mnich, G. B. Mohanty, P. Molnar, B. Monteleoni, T. Moulik, G. S. Muanza, F. Muheim, A. J.M. Muijs, M. Napolitano, F. Nessi-Tedaldi, H. Newman, T. Niessen, A. Nisati, H. Nowak, Y. D. Oh, G. Organtini, R. Ostonen, C. Palomares, D. Pandoulas, S. Paoletti, P. Paolucci, H. K. Park, I. H. Park, G. Pascale, G. Passaleva, S. Patricelli, T. Paul, M. Pauluzzi, C. Paus, F. Pauss, D. Peach, M. Pedace, Y. J. Pei, S. Pensotti, D. Perret-Gallix, B. Petersen, D. Piccolo, M. Pieri, P. A. Piroué, E. Pistolesi, V. Plyaskin, M. Pohl, V. Pojidaev, H. Postema, J. Pothier, N. Produit, D. O. Prokofiev, D. Prokofiev, J. Quartieri, G. Rahal-Callot, M. A. Rahaman, N. Raja, R. Ramelli, P. G. Rancoita, G. Raven, P. Razis, D. Ren, M. Rescigno, S. Reucroft, T. van Rhee, S. Riemann, K. Riles, A. Robohm, J. Rodin, B. P. Roe, L. Romero, A. Rosca, S. Rosier-Lees, J. A. Rubio, D. Ruschmeier, H. Rykaczewski, S. Sarkar, J. Salicio, E. Sanchez, M. P. Sanders, M. E. Sarakinos, C. Schäfer, V. Schegelsky, S. Schmidt-Kaerst, D. Schmitz, H. Schopper, D. J. Schotanus, J. Schwenke, G. Schwering, C. Sciacca, D. Sciarrino, A. Seganti, L. Servoli, S. Shevchenko, N. Shivarov, V. Shoutko, E. Shumilov, A. Shvorob, T. Siedenburg, D. Son, B. Smith, P. Spillantini, M. Steuer, D. P. Stickland, A. Stone, H. Stone, B. Stoyanov, A. Straessner, K. Sudhakar, G. Sultanov, L. Z. Sun, H. Suter, J. D. Swain, Z. Szillasi, X. W. Tang, L. Tauscher, L. Taylor, C. Timmermans, S. C.C. Ting, S. M. Ting, S. C. Tonwar, J. Tóth, C. Tully, K. L. Tung, Y. Uchida, J. Ulbricht, E. Valente, G. Vesztergombi, I. Vetlitsky, D. Vicinanza, G. Viertel, S. Villa, M. Vivargent, S. Vlachos, I. Vodopianov, H. Vogel, H. Vogt, I. Vorobiev, A. A. Vorobyov, A. Vorvolakos, M. Wadhwa, W. Wallraff, M. Wang, X. L. Wang, Z. M. Wang, A. Weber, M. Weber, P. Wienemann, H. Wilkens, S. X. Wu, S. Wynhoff, L. Xia, Z. Z. Xu, B. Z. Yang, C. G. Yang, H. J. Yang, M. Yang, J. B. Ye, S. C. Yeh, J. M. You, A. Zalite, Y. Zalite, Z. P. Zhang, G. Y. Zhu, R. Y. Zhu, A. Zichichi, F. Ziegler, G. Zilizi, M. Zöller
  • National Institute for Nuclear Physics
  • University of Geneva
  • CIEMAT
  • University of Lausanne
  • CERN
  • Swiss Federal Institute of Technology Zurich
  • Louisiana State University
  • Nuclear Physics Institute
  • Institute of Atomic Physics and University of Bucharest
  • Alikhanov Institute for Theoretical and Experimental Physics
  • University of Michigan, Ann Arbor
  • Tata Institute of Fundamental Research
  • University of Rome La Sapienza
  • University of Alabama
  • Université de Savoie
  • Paul Scherrer Institute
  • University of Perugia
  • Massachusetts Institute of Technology
  • Carnegie Mellon University
  • University of Amsterdam
  • RWTH Aachen University
  • Wigner Research Centre for Physics
  • University of California at San Diego
  • Utrecht University
  • National Central University
  • ICSC - World Laboratory
  • Universite Claude Bernard Lyon 1
  • CAS - Institute of High Energy Physics
  • University of Science and Technology of China
  • University of Salerno
  • Humboldt University of Berlin
  • Radboud University Nijmegen
  • Princeton University
  • University of Santiago de Compostela
  • University of Basel
  • California Institute of Technology
  • Northeastern University
  • Purdue University
  • University of Cyprus
  • German Electron Synchrotron
  • Korea Advanced Institute of Science and Technology
  • University of Helsinki
  • University of Hamburg
  • Bulgarian Academy of Sciences
  • National Tsing Hua University

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

The two-photon width Γγγ of the ηc meson has been measured with the L3 detector at LEP. The ηc is studied in the decay modes π+ π-π+π-, π+ π- K+K-, Ks 0 K± π, K+ K- π0, π+ π- η, π+ π- η′, and ρ+ ρ- using an integrated luminosity of 140 pb-1 at √s ≃ 91 GeV and of 52 pb-1 at √s ≃ 183 GeV. The result is Γγγ (ηc) = 6.9 ± 1.7 stat ± 0.8 sys ± 2.0(BR) keV. The Q2 dependence of the ηc cross section is studied for Q2 < 9 GeV2. It is found to be better described by a Vector Meson Dominance model form factor with a J-pole than with a p-pole. In addition, a signal of 29 ± 11 events is observed at the Xc0 mass. Upper limits for the two-photon widths of the Xc0, Xc2, and η′c are also given.

Original languageEnglish
Pages (from-to)155-166
Number of pages12
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume461
Issue number1-2
DOIs
StatePublished - 1999

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