; De Leo, R. ; De Nardo, L. ; De Sanctis, E. ; Devitsin, E. ; Di Nezza, P. ; Düren, M. ; Ehrenfried, M. ; Elalaoui-Moulay, A. ; Elbakian, G. ; Ellinghaus, F.
; Elschenbroich, U. ; Ely, J. ; Fabbri, R. ; Fantoni, A. ; Fechtchenko, A. ; Felawka, L. ; Fox, B. ; Frullani, S. ; Gapienko, G. ; Gapienko, V. ; Garibaldi, F. ; Garrow, K. ; Garutti, E. ; Gaskell, D. ; Gavrilov, G. ; Gharibyan, V. ; Graw, G. ; Grebeniouk, O. ; Greeniaus, L.G. ; Gregor, I.M. ; Hafidi, K. ; Hartig, M. ; Hasch, D. ; Heesbeen, D. ; Henoch, M. ; Hertenberger, R. ; Hesselink, W.H.A. ; Hillenbrand, A. ; Hoek, M.
; Holler, Y. ; Hommez, B. ; Iarygin, G. ; Ivanilov, A. ; Izotov, A. ; Jackson, H.E. ; Jgoun, A. ; Kaiser, R. ; Kinney, E. ; Kisselev, A. ; Kopytin, M. ; Korotkov, V. ; Kozlov, V. ; Krauss, B. ; Krivokhijine, V.G. ; Lagamba, L.
; Lapikás, L. ; Laziev, A. ; Lenisa, P. ; Liebing, P. ; Linden-Levy, L.A. ; Lipka, K. ; Lorenzon, W. ; Lu, H. ; Lu, J. ; Lu, S. ; Lu, X. ; Ma, B.-Q. ; Maiheu, B. ; Makins, N.C.R. ; Mao, Y. ; Marianski, B. ; Marukyan, H. ; Masoli, F. ; Mexner, V. ; Meyners, N. ; Mikloukho, O. ; Miller, C.A. ; Miyachi, Y. ; Muccifora, V. ; Nagaitsev, A. ; Nappi, E. ; Naryshkin, Y. ; Nass, A. ; Negodaev, M. ; Nowak, W.-D. ; Oganessyan, K. ; Ohsuga, H. ; Pickert, N. ; Potashov, S. ; Potterveld, D.H. ; Raithel, M. ; Reggiani, D. ; Reimer, P.E.
; Reischl, A. ; Reolon, A.R. ; Riedl, C. ; Rith, K. ; Rosner, G. ; Rostomyan, A. ; Rubacek, L. ; Rubin, J. ; Ryckbosch, D. ; Salomatin, Y. ; Sanjiev, I. ; Savin, I. ; Schäfer, A. ; Schill, C. ; Schnell, G. ; Schüler, K.P. ; Seele, J. ; Seidl, R. ; Seitz, B. ; Shanidze, R. ; Shearer, C. ; Shibata, T.-A. ; Shutov, V. ; Simani, M.C. ; Sinram, K. ; Stancari, M. ; Statera, M. ; Steffens, E. ; Steijger, J.J.M. ; Stenzel, H. ; Stewart, J. ; Stinzing, F. ; Stösslein, U. ; Tait, P. ; Tanaka, H. ; Taroian, S. ; Tchuiko, B. ; Terkulov, A. ; Tkabladze, A. ; Trzcinski, A. ; Tytgat, M.
; Vandenbroucke, A. ; van der Nat, P. ; van der Steenhoven, G. ; Vetterli, M.C.
; Vikhrov, V. ; Vincter, M.G.
; Vogel, C. ; Vogt, M. ; Volmer, J. ; Weiskopf, C. ; Wendland, J. ; Wilbert, J. ; Ybeles Smit, G. ; Ye, Y. ; Ye, Z. ; Yen, S. ; Yu, W. ; Zihlmann, B. ; Zohrabian, H. ; Zupranski, P. | Item type: | Article | ||||
|---|---|---|---|---|---|
| Journal or Publication Title: | Physics Letters B | ||||
| Publisher: | ELSEVIER SCIENCE BV | ||||
| Place of Publication: | AMSTERDAM | ||||
| Volume: | 585 | ||||
| Number of Issue or Book Chapter: | 3-4 | ||||
| Page Range: | pp. 213-222 | ||||
| Date: | 2004 | ||||
| Institutions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer | ||||
| Identification Number: |
| ||||
| Keywords: | SKYRME MODEL; POSITIVE-STRANGENESS; EXOTIC HADRONS; PENTAQUARK; DECUPLET; DETECTOR; glueball and nonstandard multi-quark/gluon states; photon and charged-lepton interactions with hadrons; baryon production; baryons | ||||
| Dewey Decimal Classification: | 500 Science > 530 Physics | ||||
| Status: | Published | ||||
| Refereed: | Yes, this version has been refereed | ||||
| Created at the University of Regensburg: | Yes | ||||
| Item ID: | 71631 |
Abstract
Evidence for a narrow baryon state is found in quasi-real photoproduction on a deuterium target through the decay channel pK(S)(0) --> ppi(+)pi(-). A peak is observed in the pK(S)(0) invariant mass spectrum at 1528 +/- 2.6(stat) +/- 2.1(syst) MeV. Depending on the background model, the naive statistical significance of the peak is 4-6 standard deviations and its width may be somewhat larger than ...

Abstract
Evidence for a narrow baryon state is found in quasi-real photoproduction on a deuterium target through the decay channel pK(S)(0) --> ppi(+)pi(-). A peak is observed in the pK(S)(0) invariant mass spectrum at 1528 +/- 2.6(stat) +/- 2.1(syst) MeV. Depending on the background model, the naive statistical significance of the peak is 4-6 standard deviations and its width may be somewhat larger than the experimental resolution of sigma = 4.3-6.2 MeV. This state may be interpreted as the predicted S = +1 exotic Theta(+)(uudd (s) over bar) pentaquark baryon. No signal for an hypothetical Theta(++) baryon was observed in the pK(+) invariant mass distribution. The absence of such a signal indicates that an isotensor Theta is excluded and an isovector Theta is unlikely. (C) 2004 Elsevier B.V. All rights reserved.
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