Search for a Stable Six-Quark State at BABAR

Lees, J. P. (Laboratoire d’Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France) ; Poireau, V. (Laboratoire d’Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France) ; Tisserand, V. (Laboratoire d’Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France) ; Grauges, E. (Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona, Spain) ; Palano, A. (INFN Sezione di Bari and Dipartimento di Fisica, Università di Bari, I-70126 Bari, Italy) ; Eigen, G. (University of Bergen, Institute of Physics, N-5007 Bergen, Norway) ; Brown, D. N. (Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA) ; Kolomensky, Yu. G. (Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA) ; Fritsch, M. (Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany) ; Koch, H. (Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany) ; Schroeder, T. (Ruhr Universität Bochum, Institut für Experimentalphysik 1, D-44780 Bochum, Germany) ; Hearty, C. (Institute of Particle Physics, Vancouver, British Columbia, Canada V6T 1Z1) (University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1) ; Mattison, T. S. (University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1) ; McKenna, J. A. (University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1) ; So, R. Y. (University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1) ; Blinov, V. E. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia) (Novosibirsk State University, Novosibirsk 630090, Russia) (Novosibirsk State Technical University, Novosibirsk 630092, Russia) ; Buzykaev, A. R. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia) ; Druzhinin, V. P. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia) (Novosibirsk State University, Novosibirsk 630090, Russia) ; Golubev, V. B. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia) (Novosibirsk State University, Novosibirsk 630090, Russia) ; Kozyrev, E. A. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia) (Novosibirsk State University, Novosibirsk 630090, Russia) ; Kravchenko, E. A. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia) (Novosibirsk State University, Novosibirsk 630090, Russia) ; Onuchin, A. P. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia) (Novosibirsk State University, Novosibirsk 630090, Russia) (Novosibirsk State Technical University, Novosibirsk 630092, Russia) ; Serednyakov, S. I. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia) (Novosibirsk State University, Novosibirsk 630090, Russia) ; Skovpen, Yu. I. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia) (Novosibirsk State University, Novosibirsk 630090, Russia) ; Solodov, E. P. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia) (Novosibirsk State University, Novosibirsk 630090, Russia) ; Todyshev, K. Yu. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russia) (Novosibirsk State University, Novosibirsk 630090, Russia) ; Lankford, A. J. (University of California at Irvine, Irvine, California 92697, USA) ; Gary, J. W. (University of California at Riverside, Riverside, California 92521, USA) ; Long, O. (University of California at Riverside, Riverside, California 92521, USA) ; Eisner, A. M. (University of California at Santa Cruz, Institute for Particle Physics, Santa Cruz, California 95064, USA) ; Lockman, W. S. (University of California at Santa Cruz, Institute for Particle Physics, Santa Cruz, California 95064, USA) ; Panduro Vazquez, W. (University of California at Santa Cruz, Institute for Particle Physics, Santa Cruz, California 95064, USA) ; Chao, D. S. (California Institute of Technology, Pasadena, California 91125, USA) ; Cheng, C. H. (California Institute of Technology, Pasadena, California 91125, USA) ; Echenard, B. (California Institute of Technology, Pasadena, California 91125, USA) ; Flood, K. T. (California Institute of Technology, Pasadena, California 91125, USA) ; Hitlin, D. G. (California Institute of Technology, Pasadena, California 91125, USA) ; Kim, J. (California Institute of Technology, Pasadena, California 91125, USA) ; Li, Y. (California Institute of Technology, Pasadena, California 91125, USA) ; Miyashita, T. S. (California Institute of Technology, Pasadena, California 91125, USA) ; Ongmongkolkul, P. (California Institute of Technology, Pasadena, California 91125, USA) ; Porter, F. C. (California Institute of Technology, Pasadena, California 91125, USA) ; Röhrken, M. (California Institute of Technology, Pasadena, California 91125, USA) ; Huard, Z. (University of Cincinnati, Cincinnati, Ohio 45221, USA) ; Meadows, B. T. (University of Cincinnati, Cincinnati, Ohio 45221, USA) ; Pushpawela, B. G. (University of Cincinnati, Cincinnati, Ohio 45221, USA) ; Sokoloff, M. D. (University of Cincinnati, Cincinnati, Ohio 45221, USA) ; Sun, L. (University of Cincinnati, Cincinnati, Ohio 45221, USA) ; Smith, J. G. (University of Colorado, Boulder, Colorado 80309, USA) ; Wagner, S. R. (University of Colorado, Boulder, Colorado 80309, USA) ; Bernard, D. (Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, F-91128 Palaiseau, France) ; Verderi, M. (Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, F-91128 Palaiseau, France) ; Bettoni, D. (INFN Sezione di Ferrara, I-44122 Ferrara, Italy) ; Bozzi, C. (INFN Sezione di Ferrara, I-44122 Ferrara, Italy) ; Calabrese, R. (INFN Sezione di Ferrara, I-44122 Ferrara, Italy) (Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy) ; Cibinetto, G. (INFN Sezione di Ferrara, I-44122 Ferrara, Italy) (Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy) ; Fioravanti, E. (INFN Sezione di Ferrara, I-44122 Ferrara, Italy) (Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy) ; Garzia, I. (INFN Sezione di Ferrara, I-44122 Ferrara, Italy) (Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy) ; Luppi, E. (INFN Sezione di Ferrara, I-44122 Ferrara, Italy) (Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, I-44122 Ferrara, Italy) ; Santoro, V. (INFN Sezione di Ferrara, I-44122 Ferrara, Italy) ; Calcaterra, A. (INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy) ; de Sangro, R. (INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy) ; Finocchiaro, G. (INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy) ; Martellotti, S. (INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy) ; Patteri, P. (INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy) ; Peruzzi, I. M. (INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy) ; Piccolo, M. (INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy) ; Rotondo, M. (INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy) ; Zallo, A. (INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy) ; Passaggio, S. (INFN Sezione di Genova, I-16146 Genova, Italy) ; Patrignani, C. (INFN Sezione di Genova, I-16146 Genova, Italy) ; Lacker, H. M. (Humboldt-Universität zu Berlin, Institut für Physik, D-12489 Berlin, Germany) ; Bhuyan, B. (Indian Institute of Technology Guwahati, Guwahati, Assam, 781 039, India) ; Mallik, U. (University of Iowa, Iowa City, Iowa 52242, USA) ; Chen, C. (Iowa State University, Ames, Iowa 50011, USA) ; Cochran, J. (Iowa State University, Ames, Iowa 50011, USA) ; Prell, S. (Iowa State University, Ames, Iowa 50011, USA) ; Gritsan, A. V. (Johns Hopkins University, Baltimore, Maryland 21218, USA) ; Arnaud, N. (Laboratoire de l’Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d’Orsay, F-91898 Orsay Cedex, France) ; Davier, M. (Laboratoire de l’Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d’Orsay, F-91898 Orsay Cedex, France) ; Le Diberder, F. (Laboratoire de l’Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d’Orsay, F-91898 Orsay Cedex, France) ; Lutz, A. M. (Laboratoire de l’Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d’Orsay, F-91898 Orsay Cedex, France) ; Wormser, G. (Laboratoire de l’Accélérateur Linéaire, IN2P3/CNRS et Université Paris-Sud 11, Centre Scientifique d’Orsay, F-91898 Orsay Cedex, France) ; Lange, D. J. (Lawrence Livermore National Laboratory, Livermore, California 94550, USA) ; Wright, D. M. (Lawrence Livermore National Laboratory, Livermore, California 94550, USA) ; Coleman, J. P. (University of Liverpool, Liverpool L69 7ZE, United Kingdom) ; Gabathuler, E. (University of Liverpool, Liverpool L69 7ZE, United Kingdom) ; Hutchcroft, D. E. (University of Liverpool, Liverpool L69 7ZE, United Kingdom) ; Payne, D. J. (University of Liverpool, Liverpool L69 7ZE, United Kingdom) ; Touramanis, C. (University of Liverpool, Liverpool L69 7ZE, United Kingdom) ; Bevan, A. J. (Queen Mary, University of London, London E1 4NS, United Kingdom) ; Di Lodovico, F. (Queen Mary, University of London, London E1 4NS, United Kingdom) ; Sacco, R. (Queen Mary, University of London, London E1 4NS, United Kingdom) ; Cowan, G. (University of London, Royal Holloway and Bedford New College, Egham, Surrey TW20 0EX, United Kingdom) ; Banerjee, Sw. (University of Louisville, Louisville, Kentucky 40292, USA) ; Brown, D. N. (University of Louisville, Louisville, Kentucky 40292, USA) ; Davis, C. L. (University of Louisville, Louisville, Kentucky 40292, USA) ; Denig, A. G. (Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany) ; Gradl, W. (Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany) ; Griessinger, K. (Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany) ; Hafner, A. (Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany) ; Schubert, K. R. (Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Mainz, Germany) ; Barlow, R. J. (University of Manchester, Manchester M13 9PL, United Kingdom) ; Lafferty, G. D. (University of Manchester, Manchester M13 9PL, United Kingdom) ; Cenci, R. (University of Maryland, College Park, Maryland 20742, USA) ; Jawahery, A. (University of Maryland, College Park, Maryland 20742, USA) ; Roberts, D. A. (University of Maryland, College Park, Maryland 20742, USA) ; Cowan, R. (Massachusetts Institute of Technology, Laboratory for Nuclear Science, Cambridge, Massachusetts 02139, USA) ; Robertson, S. H. (Institute of Particle Physics, Montréal, Québec, Canada H3A 2T8) (McGill University, Montréal, Québec, Canada H3A 2T8) ; Seddon, R. M. (McGill University, Montréal, Québec, Canada H3A 2T8) ; Dey, B. (INFN Sezione di Milano, I-20133 Milano, Italy) ; Neri, N. (INFN Sezione di Milano, I-20133 Milano, Italy) ; Palombo, F. (INFN Sezione di Milano, I-20133 Milano, Italy) (Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy) ; Cheaib, R. (University of Mississippi, University, Mississippi 38677, USA) ; Cremaldi, L. (University of Mississippi, University, Mississippi 38677, USA) ; Godang, R. (University of Mississippi, University, Mississippi 38677, USA) ; Summers, D. J. (University of Mississippi, University, Mississippi 38677, USA) ; Taras, P. (Université de Montréal, Physique des Particules, Montréal, Québec, Canada H3C 3J7) ; De Nardo, G. (INFN Sezione di Napoli and Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli, Italy) ; Sciacca, C. (INFN Sezione di Napoli and Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli, Italy) ; Raven, G. (NIKHEF, National Institute for Nuclear Physics and High Energy Physics, NL-1009 DB Amsterdam, Netherlands) ; Jessop, C. P. (University of Notre Dame, Notre Dame, Indiana 46556, USA) ; LoSecco, J. M. (University of Notre Dame, Notre Dame, Indiana 46556, USA) ; Honscheid, K. (Ohio State University, Columbus, Ohio 43210, USA) ; Kass, R. (Ohio State University, Columbus, Ohio 43210, USA) ; Gaz, A. (INFN Sezione di Padova, I-35131 Padova, Italy) ; Margoni, M. (INFN Sezione di Padova, I-35131 Padova, Italy) (Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy) ; Posocco, M. (INFN Sezione di Padova, I-35131 Padova, Italy) ; Simi, G. (INFN Sezione di Padova, I-35131 Padova, Italy) (Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy) ; Simonetto, F. (INFN Sezione di Padova, I-35131 Padova, Italy) (Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy) ; Stroili, R. (INFN Sezione di Padova, I-35131 Padova, Italy) (Dipartimento di Fisica, Università di Padova, I-35131 Padova, Italy) ; Akar, S. (Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France) ; Ben-Haim, E. (Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France) ; Bomben, M. (Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France) ; Bonneaud, G. R. (Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France) ; Calderini, G. (Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France) ; Chauveau, J. (Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France) ; Marchiori, G. (Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France) ; Ocariz, J. (Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Université Pierre et Marie Curie-Paris6, Université Denis Diderot-Paris7, F-75252 Paris, France) ; Biasini, M. (INFN Sezione di Perugia, I-06123 Perugia, Italy) (Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy) ; Manoni, E. (INFN Sezione di Perugia, I-06123 Perugia, Italy) ; Rossi, A. (INFN Sezione di Perugia, I-06123 Perugia, Italy) ; Batignani, G. (INFN Sezione di Pisa, I-56127 Pisa, Italy) (Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy) ; Bettarini, S. (INFN Sezione di Pisa, I-56127 Pisa, Italy) (Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy) ; Carpinelli, M. (INFN Sezione di Pisa, I-56127 Pisa, Italy) (Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy) ; Casarosa, G. (INFN Sezione di Pisa, I-56127 Pisa, Italy) (Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy) ; Chrzaszcz, M. (INFN Sezione di Pisa, I-56127 Pisa, Italy) ; Forti, F. (INFN Sezione di Pisa, I-56127 Pisa, Italy) (Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy) ; Giorgi, M. A. (INFN Sezione di Pisa, I-56127 Pisa, Italy) (Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy) ; Lusiani, A. (INFN Sezione di Pisa, I-56127 Pisa, Italy) (Scuola Normale Superiore di Pisa, I-56127 Pisa, Italy) ; Oberhof, B. (INFN Sezione di Pisa, I-56127 Pisa, Italy) (Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy) ; Paoloni, E. (INFN Sezione di Pisa, I-56127 Pisa, Italy) (Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy) ; Rama, M. (INFN Sezione di Pisa, I-56127 Pisa, Italy) ; Rizzo, G. (INFN Sezione di Pisa, I-56127 Pisa, Italy) (Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy) ; Walsh, J. J. (INFN Sezione di Pisa, I-56127 Pisa, Italy) ; Zani, L. (INFN Sezione di Pisa, I-56127 Pisa, Italy) (Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy) ; Smith, A. J. S. (Princeton University, Princeton, New Jersey 08544, USA) ; Anulli, F. (INFN Sezione di Roma, I-00185 Roma, Italy) ; Faccini, R. (INFN Sezione di Roma, I-00185 Roma, Italy) (Dipartimento di Fisica, Università di Roma La Sapienza, I-00185 Roma, Italy) ; Ferrarotto, F. (INFN Sezione di Roma, I-00185 Roma, Italy) ; Ferroni, F. (INFN Sezione di Roma, I-00185 Roma, Italy) ; Pilloni, A. (INFN Sezione di Roma, I-00185 Roma, Italy) (Dipartimento di Fisica, Università di Roma La Sapienza, I-00185 Roma, Italy) ; Piredda, G. (INFN Sezione di Roma, I-00185 Roma, Italy) ; Bünger, C. (Universität Rostock, D-18051 Rostock, Germany) ; Dittrich, S. (Universität Rostock, D-18051 Rostock, Germany) ; Grünberg, O. (Universität Rostock, D-18051 Rostock, Germany) ; Heß, M. (Universität Rostock, D-18051 Rostock, Germany) ; Leddig, T. (Universität Rostock, D-18051 Rostock, Germany) ; Voß, C. (Universität Rostock, D-18051 Rostock, Germany) ; Waldi, R. (Universität Rostock, D-18051 Rostock, Germany) ; Adye, T. (Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom) ; Wilson, F. F. (Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, United Kingdom) ; Emery, S. (CEA, Irfu, SPP, Centre de Saclay, F-91191 Gif-sur-Yvette, France) ; Vasseur, G. (CEA, Irfu, SPP, Centre de Saclay, F-91191 Gif-sur-Yvette, France) ; Aston, D. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Cartaro, C. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Convery, M. R. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Dorfan, J. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Dunwoodie, W. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Ebert, M. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Field, R. C. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Fulsom, B. G. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Graham, M. T. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Hast, C. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Innes, W. R. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Kim, P. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Leith, D. W. G. S. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Luitz, S. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; MacFarlane, D. B. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Muller, D. R. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Neal, H. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Ratcliff, B. N. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Roodman, A. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Sullivan, M. K. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Va’vra, J. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Wisniewski, W. J. (SLAC National Accelerator Laboratory, Stanford, California 94309 USA) ; Purohit, M. V. (University of South Carolina, Columbia, South Carolina 29208, USA) ; Wilson, J. R. (University of South Carolina, Columbia, South Carolina 29208, USA) ; Randle-Conde, A. (Southern Methodist University, Dallas, Texas 75275, USA) ; Sekula, S. J. (Southern Methodist University, Dallas, Texas 75275, USA) ; Ahmed, H. (St. Francis Xavier University, Antigonish, Nova Scotia, Canada B2G 2W5) ; Bellis, M. (Stanford University, Stanford, California 94305, USA) ; Burchat, P. R. (Stanford University, Stanford, California 94305, USA) ; Puccio, E. M. T. (Stanford University, Stanford, California 94305, USA) ; Alam, M. S. (State University of New York, Albany, New York 12222, USA) ; Ernst, J. A. (State University of New York, Albany, New York 12222, USA) ; Gorodeisky, R. (Tel Aviv University, School of Physics and Astronomy, Tel Aviv, 69978, Israel) ; Guttman, N. (Tel Aviv University, School of Physics and Astronomy, Tel Aviv, 69978, Israel) ; Peimer, D. R. (Tel Aviv University, School of Physics and Astronomy, Tel Aviv, 69978, Israel) ; Soffer, A. (Tel Aviv University, School of Physics and Astronomy, Tel Aviv, 69978, Israel) ; Spanier, S. M. (University of Tennessee, Knoxville, Tennessee 37996, USA) ; Ritchie, J. L. (University of Texas at Austin, Austin, Texas 78712, USA) ; Schwitters, R. F. (University of Texas at Austin, Austin, Texas 78712, USA) ; Izen, J. M. (University of Texas at Dallas, Richardson, Texas 75083, USA) ; Lou, X. C. (University of Texas at Dallas, Richardson, Texas 75083, USA) ; Bianchi, F. (INFN Sezione di Torino, I-10125 Torino, Italy) (Dipartimento di Fisica, Università di Torino, I-10125 Torino, Italy) ; De Mori, F. (INFN Sezione di Torino, I-10125 Torino, Italy) (Dipartimento di Fisica, Università di Torino, I-10125 Torino, Italy) ; Filippi, A. (INFN Sezione di Torino, I-10125 Torino, Italy) ; Gamba, D. (INFN Sezione di Torino, I-10125 Torino, Italy) (Dipartimento di Fisica, Università di Torino, I-10125 Torino, Italy) ; Lanceri, L. (INFN Sezione di Trieste and Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy) ; Vitale, L. (INFN Sezione di Trieste and Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy) ; Martinez-Vidal, F. (IFIC, Universitat de Valencia-CSIC, E-46071 Valencia, Spain) ; Oyanguren, A. (IFIC, Universitat de Valencia-CSIC, E-46071 Valencia, Spain) ; Albert, J. (University of Victoria, Victoria, British Columbia, Canada V8W 3P6) ; Beaulieu, A. (University of Victoria, Victoria, British Columbia, Canada V8W 3P6) ; Bernlochner, F. U. (University of Victoria, Victoria, British Columbia, Canada V8W 3P6) ; King, G. J. (University of Victoria, Victoria, British Columbia, Canada V8W 3P6) ; Kowalewski, R. (University of Victoria, Victoria, British Columbia, Canada V8W 3P6) ; Lueck, T. (University of Victoria, Victoria, British Columbia, Canada V8W 3P6) ; Nugent, I. M. (University of Victoria, Victoria, British Columbia, Canada V8W 3P6) ; Roney, J. M. (University of Victoria, Victoria, British Columbia, Canada V8W 3P6) ; Sobie, R. J. (Institute of Particle Physics, Victoria, British Columbia, Canada V8W 3P6) (University of Victoria, Victoria, British Columbia, Canada V8W 3P6) ; Tasneem, N. (University of Victoria, Victoria, British Columbia, Canada V8W 3P6) ; Gershon, T. J. (Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom) ; Harrison, P. F. (Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom) ; Latham, T. E. (Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom) ; Prepost, R. (University of Wisconsin, Madison, Wisconsin 53706, USA) ; Wu, S. L. (University of Wisconsin, Madison, Wisconsin 53706, USA)

22 February 2019

Abstract: Recent investigations have suggested that the six-quark combination uuddss could be a deeply bound state (S) that has eluded detection so far, and a potential dark matter candidate. We report the first search for a stable, doubly strange six-quark state in ϒSΛ¯Λ¯ decays based on a sample of 90×106ϒ(2S) and 110×106ϒ(3S) decays collected by the BABAR experiment. No signal is observed, and 90% confidence level limits on the combined ϒ(2S,3S)SΛ¯Λ¯ branching fraction in the range (1.21.4)×107 are derived for mS<2.05 GeV. These bounds set stringent limits on the existence of such exotic particles.


Published in: Physical Review Letters 122 (2019)
Published by: APS
DOI: 10.1103/PhysRevLett.122.072002
arXiv: 1810.04724
License: CC-BY-4.0



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