Evidence for a narrow baryonic state decaying to K0Sp and K0Sp in deep inelastic scattering at HERA
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A resonance search has been made in the K0Sp and K0Sp 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 1521.51.5(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 22148 events. The probability of a similar signal anywhere in the range 1500-1560 MeV arising from fluctuations of the background is below 610-5. 2004 Elsevier B.V. All rights reserved.
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Collaboration, Z., Chekanov, S., Derrick, M., Loizides, J. H., Magill, S., Miglioranzi, S., ... Standage, J.
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Collaboration, ZEUS||Chekanov, S||Derrick, M||Loizides, JH||Magill, S||Miglioranzi, S||Musgrave, B||Repond, J||Yoshida, R||Mattingly, MCK||Pavel, N||Antonioli, P||Bari, G||Basile, M||Bellagamba, L||Boscherini, D||Bruni, A||Bruni, G||Romeo, G Cara||Cifarelli, L||Cindolo, F||Contin, A||Corradi, M||De Pasquale, S||Giusti, P||Iacobucci, G||Margotti, A||Montanari, A||Nania, R||Palmonari, F||Pesci, A||Rinaldi, L||Sartorelli, G||Zichichi, A||Aghuzumtsyan, G||Bartsch, D||Brock, I||Goers, S||Hartmann, H||Hilger, E||Irrgang, P||Jakob, H-P||Kind, O||Meyer, U||Paul, E||Rautenberg, J||Renner, R||Stifutkin, A||Tandler, J||Voss, KC||Wang, M||Bailey, DS||Brook, NH||Cole, JE||Heath, GP||Namsoo, T||Robins, S||Wing, M||Capua, M||Mastroberardino, A||Schioppa, M||Susinno, G||Kim, JY||Lim, IT||Ma, KJ||Pac, MY||Helbich, M||Ning, Y||Ren, Z||Schmidke, WB||Sciulli, F||Chwastowski, J||Eskreys, A||Figiel, J||Galas, A||Olkiewicz, K||Stopa, P||Zawiejski, L||Adamczyk, L||Bołd, T||Grabowska-Bołd, I||Kisielewska, D||Kowal, AM||Kowal, M||Łukasik, J||Przybycień, M||Suszycki, L||Szuba, D||Szuba, J||Kotański, A||Słomiński, W||Adler, V||Behrens, U||Bloch, I||Borras, K||Chiochia, V||Dannheim, D||Drews, G||Fourletova, J||Fricke, U||Geiser, A||Göttlicher, P||Gutsche, O||Haas, T||Hain, W||Hillert, S||Horn, C||Kahle, B||Kötz, U||Kowalski, H||Kramberger, G||Labes, H||Lelas, D||Lim, H||Löhr, B||Mankel, R||Melzer-Pellmann, I-A||Nguyen, CN||Notz, D||Nuncio-Quiroz, AE||Polini, A||Raval, A||Rurua, L||Schneekloth, U||Stösslein, U||Wolf, G||Youngman, C||Zeuner, W||Schlenstedt, S||Barbagli, G||Gallo, E||Genta, C||Pelfer, PG||Bamberger, A||Benen, A||Karstens, F||Dobur, D||Vlasov, NN||Bell, M||Bussey, PJ||Doyle, AT||Ferrando, J||Hamilton, J||Hanlon, S||Saxon, DH||Skillicorn, IO||Gialas, I||Carli, T||Gosau, T||Holm, U||Krumnack, N||Lohrmann, E||Milite, M||Salehi, H||Schleper, P||Schörner-Sadenius, T||Stonjek, S||Wichmann, K||Wick, K||Ziegler, A||Ziegler, Ar||Collins-Tooth, C||Foudas, C||Gonçalo, R||Long, KR||Tapper, AD||Cloth, P||Filges, D||Kataoka, M||Nagano, K||Tokushuku, K||Yamada, S||Yamazaki, Y||Barakbaev, AN||Boos, EG||Pokrovskiy, NS||Zhautykov, BO||Son, D||Piotrzkowski, K||Barreiro, F||Glasman, C||González, O||Labarga, L||del Peso, J||Tassi, E||Terrón, J||Zambrana, M||Barbi, M||Corriveau, F||Gliga, S||Lainesse, J||Padhi, S||Stairs, DG||Walsh, R||Tsurugai, T||Antonov, A||Danilov, P||Dolgoshein, BA||Gladkov, D||Sosnovtsev, V||Suchkov, S||Dementiev, RK||Ermolov, PF||Katkov, II||Khein, LA||Korzhavina, IA||Kuzmin, VA||Levchenko, BB||Lukina, O Yu||Proskuryakov, AS||Shcheglova, LM||Zotkin, SA||Abt, I||Büttner, C||Caldwell, A||Liu, X||Sutiak, J||Coppola, N||Grijpink, S||Koffeman, E||Kooijman, P||Maddox, E||Pellegrino, A||Schagen, S||Tiecke, H||Vázquez, M||Wiggers, L||de Wolf, E||Brümmer, N||Bylsma, B||Durkin, LS||Ling, TY||Cooper-Sarkar, AM||Cottrell, A||Devenish, RCE||Foster, B||Grzelak, G||Gwenlan, C||Kohno, T||Patel, S||Straub, PB||Walczak, R||Bertolin, A||Brugnera, R||Carlin, R||Dal Corso, F||Dusini, S||Garfagnini, A||Limentani, S||Longhin, A||Parenti, A||Posocco, M||Stanco, L||Turcato, M||Heaphy, EA||Metlica, F||Oh, BY||Whitmore, JJ||Iga, Y||D'Agostini, G||Marini, G||Nigro, A||Cormack, C||Hart, JC||McCubbin, NA||Heusch, C||Park, IH||Abramowicz, H||Gabareen, A||Kananov, S||Kreisel, A||Levy, A||Kuze, M||Fusayasu, T||Kagawa, S||Tawara, T||Yamashita, T||Hamatsu, R||Hirose, T||Inuzuka, M||Kaji, H||Kitamura, S||Matsuzawa, K||Costa, M||Ferrero, MI||Monaco, V||Sacchi, R||Solano, A||Arneodo, M||Ruspa, M||Koop, T||Martin, JF||Mirea, A||Butterworth, JM||Hall-Wilton, R||Jones, TW||Lightwood, MS||Sutton, MR||Targett-Adams, C||Ciborowski, J||Ciesielski, R||Łużniak, P||Nowak, RJ||Pawlak, JM||Sztuk, J||Tymieniecka, T||Ukleja, A||Ukleja, J||Żarnecki, AF||Adamus, M||Plucinski, P||Eisenberg, Y||Hochman, D||Karshon, U||Riveline, M||Everett, A||Gladilin, LK||Kçira, D||Lammers, S||Li, L||Reeder, DD||Rosin, M||Ryan, P||Savin, AA||Smith, WH||Dhawan, S||Bhadra, S||Catterall, CD||Fourletov, S||Hartner, G||Menary, S||Soares, M||Standage, J
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http://dx.doi.org/10.1016/j.physletb.2004.04.024