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Evidence for a narrow baryonic state decaying to KS0p and KS0p̄ in deep inelastic scattering at HERA

  • S. Chekanov*
  • , M. Derrick
  • , J. H. Loizides
  • , S. Magill
  • , S. Miglioranzi
  • , B. Musgrave
  • , J. Repond
  • , R. Yoshida
  • , M. C.K. Mattingly
  • , N. Pavel
  • , P. Antonioli
  • , G. Bari
  • , M. Basile
  • , L. Bellagamba
  • , D. Boscherini
  • , A. Bruni
  • , G. Bruni
  • , G. Cara Romeo
  • , L. Cifarelli
  • , F. Cindolo
  • A. Contin, M. Corradi, S. de Pasquale, P. Giusti, G. Iacobucci, A. Margotti, A. Montanari, R. Nania, F. Palmonari, A. Pesci, L. Rinaldi, G. Sartorelli, A. Zichichi, G. Aghuzumtsyan, D. Bartsch, I. Brock, S. Goers, H. Hartmann, E. Hilger, P. Irrgang, H. P. Jakob, O. Kind, U. Meyer, E. Paul, J. Rautenberg, R. Renner, A. Stifutkin, J. Tandler, K. C. Voss, M. Wang, D. S. Bailey, N. H. Brook, J. E. Cole, G. P. Heath, T. Namsoo, S. Robins, M. Wing, M. Capua, A. Mastroberardino, M. Schioppa, G. Susinno, J. Y. Kim, I. T. Lim, K. J. Ma, M. Y. Pac, M. Helbich, Y. Ning, Z. Ren, W. B. Schmidke, F. Sciulli, J. Chwastowski, A. Eskreys, J. Figiel, A. Galas, K. Olkiewicz, P. Stopa, L. Zawiejski, L. Adamczyk, T. Bold, I. Grabowska-Bold, D. Kisielewska, A. M. Kowal, M. Kowal, J. Łukasik, M. Przybycień, L. Suszycki, D. Szuba, J. Szuba, A. Kotański, W. Slomiński, V. Adler, U. Behrens, I. Bloch, K. Borras, V. Chiochia, D. Dannheim, G. Drews, J. Fourletova, U. Fricke, A. Geiser, P. Göttlicher, O. Gutsche, T. Haas, W. Hain, S. Hillert, C. Horn, B. Kahle, U. Kötz, H. Kowalski, G. Kramberger, H. Labes, D. Lelas, H. Lim, B. Löhr, R. Mankel, I. A. Melzer-Pellmann, C. N. Nguyen, D. Notz, A. E. Nuncio-Quiroz, A. Polini, A. Raval, L. Rurua, U. Schneekloth, U. Stösslein, G. Wolf, C. Youngman, W. Zeuner, S. Schlenstedt, G. Barbagli, E. Gallo, C. Genta, P. G. Pelfer, A. Bamberger, A. Benen, F. Karstens, D. Dobur, N. N. Vlasov, M. Bell, P. J. Bussey, A. T. Doyle, J. Ferrando, J. Hamilton, S. Hanlon, D. H. Saxon, I. O. Skillicorn, I. Gialas, T. Carli, T. Gosau, U. Holm, N. Krumnack, E. Lohrmann, M. Milite, H. Salehi, P. Schleper, T. Schörner-Sadenius, S. Stonjek, K. Wichmann, K. Wick, A. Ziegler, A. Ziegler, C. Collins-Tooth, C. Foudas, R. Gonçalo, K. R. Long, A. D. Tapper, P. Cloth, D. Filges, M. Kataoka, K. Nagano, K. Tokushuku, S. Yamada, Y. Yamazaki, A. N. Barakbaev, E. G. Boos, N. S. Pokrovskiy, B. O. Zhautykov, D. Son, K. Piotrzkowski, F. Barreiro, C. Glasman, O. González, L. Labarga, J. del Peso, E. Tassi, J. Terrón, M. Zambrana, M. Barbi, F. Corriveau, S. Gliga, J. Lainesse, S. Padhi, D. G. Stairs, R. Walsh, T. Tsurugai, A. Antonov, P. Danilov, B. A. Dolgoshein, D. Gladkov, V. Sosnovtsev, S. Suchkov, R. K. Dementiev, P. F. Ermolov, I. I. Katkov, L. A. Khein, I. A. Korzhavina, V. A. Kuzmin, B. B. Levchenko, O. Y. Lukina, A. S. Proskuryakov, L. M. Shcheglova, S. A. Zotkin, I. Abt, C. Büttner, A. Caldwell, X. Liu, J. Sutiak, N. Coppola, S. Grijpink, E. Koffeman, P. Kooijman, E. Maddox, A. Pellegrino, S. Schagen, H. Tiecke, M. Vázquez, L. Wiggers, E. de Wolf, N. Brümmer, B. Bylsma, L. S. Durkin, T. Y. Ling, A. M. Cooper-Sarkar, A. Cottrell, R. C.E. Devenish, B. Foster, G. Grzelak, C. Gwenlan, T. Kohno, S. Patel, P. B. Straub, R. Walczak, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, S. Dusini, A. Garfagnini, S. Limentani, A. Longhin, A. Parenti, M. Posocco, L. Stanco, M. Turcato, E. A. Heaphy, F. Metlica, B. Y. Oh, J. J. Whitmore, Y. Iga, G. D'Agostini, G. Marini, A. Nigro, C. Cormack, J. C. Hart, N. A. McCubbin, C. Heusch, I. H. Park, H. Abramowicz, A. Gabareen, S. Kananov, A. Kreisel, A. Levy, M. Kuze, T. Fusayasu, S. Kagawa, T. Tawara, T. Yamashita, R. Hamatsu, T. Hirose, M. Inuzuka, H. Kaji, S. Kitamura, K. Matsuzawa, M. Costa, M. I. Ferrero, V. Monaco, R. Sacchi, A. Solano, M. Arneodo, M. Ruspa, T. Koop, J. F. Martin, A. Mirea, J. M. Butterworth, R. Hall-Wilton, T. W. Jones, M. S. Lightwood, M. R. Sutton, C. Targett-Adams, J. Ciborowski, R. Ciesielski, P. Łuzniak, R. J. Nowak, J. M. Pawlak, J. Sztuk, T. Tymieniecka, A. Ukleja, J. Ukleja, A. F. Zarnecki, M. Adamus, P. Plucinski, Y. Eisenberg, D. Hochman, U. Karshon, M. Riveline, A. Everett, L. K. Gladilin, D. Kçira, S. Lammers, L. Li, D. D. Reeder, M. Rosin, P. Ryan, A. A. Savin, W. H. Smith, S. Dhawan, S. Bhadra, C. D. Catterall, S. Fourletov, G. Hartner, S. Menary, M. Soares, J. Standage
*Corresponding author for this work
  • Argonne National Laboratory
  • Andrews University
  • Humboldt University of Berlin
  • National Institute for Nuclear Physics
  • University of Bonn
  • University of Bristol
  • University of Calabria
  • Chonnam National University
  • Dongshin University
  • Columbia University
  • Institute of Nuclear Physics Polish Academy of Sciences
  • AGH University of Krakow
  • Jagiellonian University in Kraków
  • German Electron Synchrotron
  • University of Oxford
  • University of Freiburg
  • University of Glasgow
  • University of the Aegean
  • University of Hamburg
  • Imperial College London
  • Royal Holloway University of London
  • Jülich Research Centre
  • High Energy Accelerator Research Organization, Institute of Particle and Nuclear Physics
  • Ministry of Education and Science of the Republic of Kazakhstan
  • Kyungpook National University
  • Université catholique de Louvain
  • Universidad Autónoma de Madrid
  • McGill University
  • Meiji Gakuin University
  • Moscow Engineering Physics Institute
  • Lomonosov Moscow State University
  • Max Planck Institute for Physics (Werner Heisenberg Institute)
  • University of Amsterdam
  • Ohio State University
  • Pennsylvania State University
  • Polytechnic University Japan
  • University of Rome La Sapienza
  • Rutherford Appleton Laboratory
  • Queen Mary University of London
  • University of California at Santa Cruz
  • Ewha Womans University
  • Tel Aviv University
  • Institute of Science Tokyo
  • The University of Tokyo
  • Tokyo Metropolitan University
  • University of Turin
  • University of Eastern Piedmont
  • University of Toronto
  • University College London
  • University of Warsaw
  • University of Lodz
  • Institute of Nuclear Chemistry and Technology, Warsaw
  • Weizmann Institute of Science
  • University of Wisconsin-Madison
  • Yale University
  • York University Toronto

Research output: Contribution to journalArticlepeer-review

212 Scopus citations

Abstract

A resonance search has been made in the K0Sp and K0Sp̄ invariant-mass spectrum measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb-1. The search was performed in the central rapidity region of inclusive deep inelastic scattering at an ep centre-of-mass energy of 300-318 GeV for exchanged photon virtuality, Q2, above 1 GeV2. Recent results from fixed-target experiments give evidence for a narrow baryon resonance decaying to K+n and K0Sp, interpreted as a pentaquark. The results presented here support the existence of such state, with a mass of 1521.5±1.5(stat.)+2.8-1.7(syst.) MeV and a Gaussian width consistent with the experimental resolution of 2 MeV. The signal is visible at high Q2 and, for Q2>20 GeV2, contains 221±48 events. The probability of a similar signal anywhere in the range 1500-1560 MeV arising from fluctuations of the background is below 6×10-5.

Original languageEnglish
Pages (from-to)7-22
Number of pages16
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume591
Issue number1-2
DOIs
StatePublished - 1 Jul 2004

Funding

FundersFunder number
UK Research and Innovation53706

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