Abstract
Evidence for a narrow baryon state is found in quasi-real photoproduction on a deuterium target through the decay channel pK0 S→pπ+π-. A peak is observed in the pK0 S 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 σ=4.3-6.2 MeV. This state may be interpreted as the predicted S=+1 exotic Θ +(uudds̄) pentaquark baryon. No signal for an hypothetical Θ++ baryon was observed in the pK+ invariant mass distribution. The absence of such a signal indicates that an isotensor Θ is excluded and an isovector Θ is unlikely.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 213-222 |
| Number of pages | 10 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 585 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Apr 15 2004 |
Keywords
- 12.39.Mk
- 13.60.-r
- 13.60.Rj
- 14.20.-c
- Baryon production
- Baryons
- Glueball and nonstandard multi-quark/gluon states
- Photon and charged-lepton interactions with hadrons
ASJC Scopus subject areas
- Nuclear and High Energy Physics
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Evidence for a narrow |S| = 1 baryon state at a mass of 1528 MeV in quasi-real photoproduction. / Airapetian, A.; Akopov, N.; Akopov, Z.; Amarian, M.; Ammosov, V. V.; Andrus, A.; Aschenauer, E. C.; Augustyniak, W.; Avakian, R.; Avetissian, A.; Avetissian, E.; Bailey, P.; Balin, D.; Baturin, V.; Beckmann, M.; Belostotski, S.; Bernreuther, S.; Bianchi, N.; Blok, H. P.; Böttcher, H.; Borissov, A.; Borysenko, A.; Bouwhuis, M.; Brack, J.; Brüll, A.; Bryzgalov, V.; Capitani, G. P.; Chen, T.; Chen, X.; Chiang, H. C.; Ciullo, G.; Contalbrigo, M.; Dalpiaz, P. F.; Deconinck, W.; 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.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 585, No. 3-4, 15.04.2004, p. 213-222.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Evidence for a narrow |S| = 1 baryon state at a mass of 1528 MeV in quasi-real photoproduction
AU - Airapetian, A.
AU - Akopov, N.
AU - Akopov, Z.
AU - Amarian, M.
AU - Ammosov, V. V.
AU - Andrus, A.
AU - Aschenauer, E. C.
AU - Augustyniak, W.
AU - Avakian, R.
AU - Avetissian, A.
AU - Avetissian, E.
AU - Bailey, P.
AU - Balin, D.
AU - Baturin, V.
AU - Beckmann, M.
AU - Belostotski, S.
AU - Bernreuther, S.
AU - Bianchi, N.
AU - Blok, H. P.
AU - Böttcher, H.
AU - Borissov, A.
AU - Borysenko, A.
AU - Bouwhuis, M.
AU - Brack, J.
AU - Brüll, A.
AU - Bryzgalov, V.
AU - Capitani, G. P.
AU - Chen, T.
AU - Chen, X.
AU - Chiang, H. C.
AU - Ciullo, G.
AU - Contalbrigo, M.
AU - Dalpiaz, P. F.
AU - Deconinck, W.
AU - de Leo, R.
AU - de Nardo, L.
AU - de Sanctis, E.
AU - Devitsin, E.
AU - di Nezza, P.
AU - Düren, M.
AU - Ehrenfried, M.
AU - Elalaoui-Moulay, A.
AU - Elbakian, G.
AU - Ellinghaus, F.
AU - Elschenbroich, U.
AU - Ely, J.
AU - Fabbri, R.
AU - Fantoni, A.
AU - Fechtchenko, A.
AU - Felawka, L.
AU - Fox, B.
AU - Frullani, S.
AU - Gapienko, G.
AU - Gapienko, V.
AU - Garibaldi, F.
AU - Garrow, K.
AU - Garutti, E.
AU - Gaskell, D.
AU - Gavrilov, G.
AU - Gharibyan, V.
AU - Graw, G.
AU - Grebeniouk, O.
AU - Greeniaus, L. G.
AU - Gregor, I. M.
AU - Hafidi, K.
AU - Hartig, M.
AU - Hasch, D.
AU - Heesbeen, D.
AU - Henoch, M.
AU - Hertenberger, R.
AU - Hesselink, W. H.A.
AU - Hillenbrand, A.
AU - Hoek, M.
AU - Holler, Y.
AU - Hommez, B.
AU - Iarygin, G.
AU - Ivanilov, A.
AU - Izotov, A.
AU - Jackson, H. E.
AU - Jgoun, A.
AU - Kaiser, R.
AU - Kinney, E.
AU - Kisselev, A.
AU - Kopytin, M.
AU - Korotkov, V.
AU - Kozlov, V.
AU - Krauss, B.
AU - Krivokhijine, V. G.
AU - Lagamba, L.
AU - Lapikás, L.
AU - Laziev, A.
AU - Lenisa, P.
AU - Liebing, P.
AU - Linden-Levy, L. A.
AU - Lipka, K.
AU - Lorenzon, W.
AU - Lu, H.
AU - Lu, J.
AU - Lu, S.
AU - Lu, X.
AU - Ma, B. Q.
AU - Maiheu, B.
AU - Makins, N. C.R.
AU - Mao, Y.
AU - Marianski, B.
AU - Marukyan, H.
AU - Masoli, F.
AU - Mexner, V.
AU - Meyners, N.
AU - Mikloukho, O.
AU - Miller, C. A.
AU - Miyachi, Y.
AU - Muccifora, V.
AU - Nagaitsev, A.
AU - Nappi, E.
AU - Naryshkin, Y.
AU - Nass, A.
AU - Negodaev, M.
AU - Nowak, W. D.
AU - Oganessyan, K.
AU - Ohsuga, H.
AU - Pickert, N.
AU - Potashov, S.
AU - Potterveld, D. H.
AU - Raithel, M.
AU - Reggiani, D.
AU - Reimer, P. E.
AU - Reischl, A.
AU - Reolon, A. R.
AU - Riedl, C.
AU - Rith, K.
AU - Rosner, G.
AU - Rostomyan, A.
AU - Rubacek, L.
AU - Rubin, J.
AU - Ryckbosch, D.
AU - Salomatin, Y.
AU - Sanjiev, I.
AU - Savin, I.
AU - Schäfer, A.
AU - Schill, C.
AU - Schnell, G.
AU - Schüler, K. P.
AU - Seele, J.
AU - Seidl, R.
AU - Seitz, B.
AU - Shanidze, R.
AU - Shearer, C.
AU - Shibata, T. A.
AU - Shutov, V.
AU - Simani, M. C.
AU - Sinram, K.
AU - Stancari, M.
AU - Statera, M.
AU - Steffens, E.
AU - Steijger, J. J.M.
AU - Stenzel, H.
AU - Stewart, J.
AU - Stinzing, F.
AU - Stösslein, U.
AU - Tait, P.
AU - Tanaka, H.
AU - Taroian, S.
AU - Tchuiko, B.
AU - Terkulov, A.
AU - Tkabladze, A.
AU - Trzcinski, A.
AU - Tytgat, M.
AU - Vandenbroucke, A.
AU - van der Nat, P.
AU - van der Steenhoven, G.
AU - Vetterli, M. C.
AU - Vikhrov, V.
AU - Vincter, M. G.
AU - Vogel, C.
AU - Vogt, M.
AU - Volmer, J.
AU - Weiskopf, C.
AU - Wendland, J.
AU - Wilbert, J.
AU - Ybeles Smit, G.
AU - Ye, Y.
AU - Ye, Z.
AU - Yen, S.
AU - Yu, W.
AU - Zihlmann, B.
AU - Zohrabian, H.
AU - Zupranski, P.
N1 - Funding Information: We thank Markus Diehl, T.-S.H. Lee, Kim Maltman, Maxim Polyakov and Craig Roberts for stimulating discussions. We gratefully acknowledge the DESY management for its support and the staff at DESY and the collaborating institutions for their significant effort. This work was supported by the FWO-Flanders, Belgium; the Natural Sciences and Engineering Research Council of Canada; the National Natural Science Foundation of China; the INTAS and ESOP network contributions from the European Community; the German Bundesministerium für Bildung und Forschung; the Deutsche Forschungsgemeinschaft (DFG); the Deutscher Akademischer Austauschdienst (DAAD); the Italian Istituto Nazionale di Fisica Nucleare (INFN); Monbusho International Scientific Research Program, JSPS, and Toray Science Foundation of Japan; the Dutch Foundation for Fundamenteel Onderzoek der Materie (FOM); the UK Engineering and Physical Sciences Research Council and the Particle Physics and Astronomy Research Council; and the US Department of Energy and the National Science Foundation.
PY - 2004/4/15
Y1 - 2004/4/15
N2 - Evidence for a narrow baryon state is found in quasi-real photoproduction on a deuterium target through the decay channel pK0 S→pπ+π-. A peak is observed in the pK0 S 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 σ=4.3-6.2 MeV. This state may be interpreted as the predicted S=+1 exotic Θ +(uudds̄) pentaquark baryon. No signal for an hypothetical Θ++ baryon was observed in the pK+ invariant mass distribution. The absence of such a signal indicates that an isotensor Θ is excluded and an isovector Θ is unlikely.
AB - Evidence for a narrow baryon state is found in quasi-real photoproduction on a deuterium target through the decay channel pK0 S→pπ+π-. A peak is observed in the pK0 S 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 σ=4.3-6.2 MeV. This state may be interpreted as the predicted S=+1 exotic Θ +(uudds̄) pentaquark baryon. No signal for an hypothetical Θ++ baryon was observed in the pK+ invariant mass distribution. The absence of such a signal indicates that an isotensor Θ is excluded and an isovector Θ is unlikely.
KW - 12.39.Mk
KW - 13.60.-r
KW - 13.60.Rj
KW - 14.20.-c
KW - Baryon production
KW - Baryons
KW - Glueball and nonstandard multi-quark/gluon states
KW - Photon and charged-lepton interactions with hadrons
UR - http://www.scopus.com/inward/record.url?scp=4344711281&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4344711281&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2004.01.079
DO - 10.1016/j.physletb.2004.01.079
M3 - Article
AN - SCOPUS:4344711281
VL - 585
SP - 213
EP - 222
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 3-4
ER -