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Search for an exotic S=−2, Q=−2 baryon resonance at a mass near 1862 MeV in quasireal photoproduction

A. Airapetian18, N. Akopov30, Z. Akopov30, M. Amarian8,30, A. Andrus16, E. C. Aschenauer8, W. Augustyniak29, R. Avakian30, A. Avetissian30 et al. (HERMES Collaboration)

A. Avetissian30, E. Avetissian12, P. Bailey16, D. Balin21, M. Beckmann7, S. Belostotski21, N. Bianchi12, H. P. Blok20,28, H. Böttcher8, A. Borissov15, A. Borysenko12, M. Bouwhuis16, A. Brüll17, V. Bryzgalov22, M. Capiluppi11, G. P. Capitani12, T. Chen4, G. Ciullo11, M. Contalbrigo11, P. F. Dalpiaz11, W. Deconinck18, R. De Leo3, M. Demey20, L. De Nardo1, E. De Sanctis12, E. Devitsin19, M. Diefenthaler10, P. Di Nezza12, J. Drechsler20, M. Düren14, M. Ehrenfried10, A. Elalaoui-Moulay2, G. Elbakian30, F. Ellinghaus6, U. Elschenbroich13, R. Fabbri20, A. Fantoni12, L. Felawka26, S. Frullani24, A. Funel12, G. Gapienko22, V. Gapienko22, F. Garibaldi24, K. Garrow26, G. Gavrilov7,26, V. Gharibyan30, F. Giordano11, O. Grebeniouk21, I. M. Gregor8, C. Hadjidakis12, K. Hafidi2, M. Hartig14, D. Hasch12, W. H. A. Hesselink20,28, A. Hillenbrand10, M. Hoek14, Y. Holler7, B. Hommez13, I. Hristova8, G. Iarygin9, A. Ivanilov22, A. Izotov21, H. E. Jackson2, A. Jgoun21, R. Kaiser15, T. Keri14, E. Kinney6, A. Kisselev6,21, T. Kobayashi27, M. Kopytin8, V. Korotkov22, V. Kozlov19, B. Krauss10, V. G. Krivokhijine9, L. Lagamba3, L. Lapikás20, A. Laziev20,28, P. Lenisa11, P. Liebing8, L. A. Linden-Levy16, W. Lorenzon18, H. Lu5, J. Lu26, S. Lu14, B.-Q. Ma4, B. Maiheu13, N. C. R. Makins16, Y. Mao4, B. Marianski29, H. Marukyan30, F. Masoli11, V. Mexner20, N. Meyners7, T. Michler10, O. Mikloukho21, C. A. Miller1,26, Y. Miyachi27, V. Muccifora12, M. Murray15, A. Nagaitsev9, E. Nappi3, Y. Naryshkin21, M. Negodaev8, W.-D. Nowak8, K. Oganessyan7,12, H. Ohsuga27, A. Osborne15, N. Pickert10, D. H. Potterveld2, M. Raithel10, D. Reggiani10, P. E. Reimer2, A. Reischl20, A. R. Reolon12, C. Riedl10, K. Rith10, G. Rosner15, A. Rostomyan30, L. Rubacek14, J. Rubin16, D. Ryckbosch13, Y. Salomatin22, I. Sanjiev2,21, I. Savin9, A. Schäfer23, G. Schnell27, K. P. Schüler7, J. Seele6, R. Seidl10, B. Seitz14, C. Shearer15, T.-A. Shibata27, V. Shutov9, K. Sinram7, W. Sommer14, M. Stancari11, M. Statera11, E. Steffens10, J. J. M. Steijger20, H. Stenzel14, J. Stewart8, F. Stinzing10, P. Tait10, H. Tanaka27, S. Taroian30, B. Tchuiko22, A. Terkulov19, A. Trzcinski29, M. Tytgat13, A. Vandenbroucke13, P. B. van der Nat20, G. van der Steenhoven20, Y. van Haarlem13, V. Vikhrov21, M. G. Vincter1, C. Vogel10, J. Volmer8, S. Wang5, J. Wendland25,26, Y. Ye5, Z. Ye7, S. Yen26, B. Zihlmann13, and P. Zupranski29 (HERMES Collaboration)

  • 1Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1
  • 2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USA
  • 3Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70124 Bari, Italy
  • 4School of Physics, Peking University, Beijing 100871, China
  • 5Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
  • 6Nuclear Physics Laboratory, University of Colorado, Boulder, Colorado 80309-0446, USA
  • 7DESY, 22603 Hamburg, Germany
  • 8DESY, 15738 Zeuthen, Germany
  • 9Joint Institute for Nuclear Research, 141980 Dubna, Russia
  • 10Physikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
  • 11Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, Italy
  • 12Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
  • 13Department of Subatomic and Radiation Physics, University of Gent, 9000 Gent, Belgium
  • 14Physikalisches Institut, Universität Gießen, 35392 Gießen, Germany
  • 15Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
  • 16Department of Physics, University of Illinois, Urbana, Illinois 61801-3080, USA
  • 17Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 18Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120, USA
  • 19Lebedev Physical Institute, 117924 Moscow, Russia
  • 20Nationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), 1009 DB Amsterdam, The Netherlands
  • 21Petersburg Nuclear Physics Institute, St. Petersburg, Gatchina, 188350 Russia
  • 22Institute for High Energy Physics, Protvino, Moscow region, 142281 Russia
  • 23Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany
  • 24Istituto Nazionale di Fisica Nucleare, Sezione Roma 1, Gruppo Sanità and Physics Laboratory, Istituto Superiore di Sanità, 00161 Roma, Italy
  • 25Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
  • 26TRIUMF, Vancouver, British Columbia, Canada V6T 2A3
  • 27Department of Physics, Tokyo Institute of Technology, Tokyo 152, Japan
  • 28Department of Physics and Astronomy, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands
  • 29Andrzej Soltan Institute for Nuclear Studies, 00-689 Warsaw, Poland
  • 30Yerevan Physics Institute, 375036 Yerevan, Armenia

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Phys. Rev. D 71, 032004 – Published 10 February, 2005

DOI: https://doi.org/10.1103/PhysRevD.71.032004

Abstract

A search for an exotic baryon resonance with S=−2, Q=−2 has been performed in quasireal photoproduction on a deuterium target through the decay channel Ξ−π−→Λπ−π−→pπ−π−π−. No evidence for a previously reported Ξ--(1860) resonance is found in the Ξ−π− invariant mass spectrum. An upper limit for the photoproduction cross section of 2.1 nb is found at the 90% confidence level. The photoproduction cross section for the Ξ0(1530) is found to be between 9 and 24 nb.

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Phys. Rev. D 71, 032004– Published 10 February, 2005
  • Received 10 December 2004

© 2005 American Physical Society

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