Evidence for a narrow |S| = 1 baryon state at a mass of 1528 MeV in quasi-real photoproduction

A. Airapetian; N. Akopov; Z. Akopov; M. Amarian; V. V. Ammosov; A. Andrus; E. C. Aschenauer; W. Augustyniak; R. Avakian; A. Avetissian; E. Avetissian; P. Bailey; D. Balin; V. Baturin; M. Beckmann; S. Belostotski; S. Bernreuther; N. Bianchi; H. P. Blok; H. Böttcher; A. Borissov; A. Borysenko; M. Bouwhuis; J. Brack; A. Brüll; V. Bryzgalov; G. P. Capitani; T. Chen; X. Chen; H. C. Chiang; G. Ciullo; M. Contalbrigo; P. F. Dalpiaz; W. Deconinck; R. de Leo; L. de Nardo; E. de Sanctis; E. Devitsin; P. di Nezza; M. Düren; M. Ehrenfried; A. Elalaoui-Moulay; G. Elbakian; F. Ellinghaus; U. Elschenbroich; J. Ely; R. Fabbri; A. Fantoni; A. Fechtchenko; L. Felawka; B. Fox; S. Frullani; G. Gapienko; V. Gapienko; F. Garibaldi; K. Garrow; E. Garutti; D. Gaskell; G. Gavrilov; V. Gharibyan; G. Graw; O. Grebeniouk; L. G. Greeniaus; I. M. Gregor; K. Hafidi; M. Hartig; D. Hasch; D. Heesbeen; M. Henoch; R. Hertenberger; W. H.A. Hesselink; A. Hillenbrand; M. Hoek; Y. Holler; B. Hommez; G. Iarygin; A. Ivanilov; A. Izotov; H. E. Jackson; A. Jgoun; R. Kaiser; E. Kinney; A. Kisselev; M. Kopytin; V. Korotkov; V. Kozlov; B. Krauss; V. G. Krivokhijine; L. Lagamba; L. Lapikás; A. Laziev; P. Lenisa; P. Liebing; L. A. Linden-Levy; K. Lipka; W. Lorenzon; H. Lu; J. Lu; S. Lu; X. Lu; B. Q. Ma; B. Maiheu; N. C.R. Makins; Y. Mao; B. Marianski; H. Marukyan; F. Masoli; V. Mexner; N. Meyners; O. Mikloukho; C. A. Miller; Y. Miyachi; V. Muccifora; A. Nagaitsev; E. Nappi; Y. Naryshkin; A. Nass; M. Negodaev; W. D. Nowak; K. Oganessyan; H. Ohsuga; N. Pickert; S. Potashov; D. H. Potterveld; M. Raithel; D. Reggiani; P. E. Reimer; A. Reischl; A. R. Reolon; C. Riedl; K. Rith; G. Rosner; A. Rostomyan; L. Rubacek; J. Rubin; D. Ryckbosch; Y. Salomatin; I. Sanjiev; I. Savin; A. Schäfer; C. Schill; G. Schnell; K. P. Schüler; J. Seele; R. Seidl; B. Seitz; R. Shanidze; C. Shearer; T. A. Shibata; V. Shutov; M. C. Simani; K. Sinram; M. Stancari; M. Statera; E. Steffens; J. J.M. Steijger; H. Stenzel; J. Stewart; F. Stinzing; U. Stösslein; P. Tait; H. Tanaka; S. Taroian; B. Tchuiko; A. Terkulov; A. Tkabladze; A. Trzcinski; M. Tytgat; A. Vandenbroucke; P. van der Nat; G. van der Steenhoven; M. C. Vetterli; V. Vikhrov; M. G. Vincter; C. Vogel; M. Vogt; J. Volmer; C. Weiskopf; J. Wendland; J. Wilbert; G. Ybeles Smit; Y. Ye; Z. Ye; S. Yen; W. Yu; B. Zihlmann; H. Zohrabian; P. Zupranski

doi:10.1016/j.physletb.2004.01.079

Evidence for a narrow |S| = 1 baryon state at a mass of 1528 MeV in quasi-real photoproduction

A. Airapetian, N. Akopov, Z. Akopov, M. Amarian, V. V. Ammosov, A. Andrus, E. C. Aschenauer, W. Augustyniak, R. Avakian, A. Avetissian, E. Avetissian, P. Bailey, D. Balin, V. Baturin, M. Beckmann, S. Belostotski, S. Bernreuther, N. Bianchi, H. P. Blok, H. BöttcherA. Borissov, A. Borysenko, M. Bouwhuis, J. Brack, A. Brüll, V. Bryzgalov, G. P. Capitani, T. Chen, X. Chen, H. C. Chiang, G. Ciullo, M. Contalbrigo, P. F. Dalpiaz, W. Deconinck, R. de Leo, L. de Nardo, E. de Sanctis, E. Devitsin, P. di Nezza, M. Düren, M. Ehrenfried, A. Elalaoui-Moulay, G. Elbakian, F. Ellinghaus, U. Elschenbroich, J. Ely, R. Fabbri, A. Fantoni, A. Fechtchenko, L. Felawka, B. Fox, S. Frullani, G. Gapienko, V. Gapienko, F. Garibaldi, K. Garrow, E. Garutti, D. Gaskell, G. Gavrilov, V. Gharibyan, G. Graw, O. Grebeniouk, L. G. Greeniaus, I. M. Gregor, K. Hafidi, M. Hartig, D. Hasch, D. Heesbeen, M. Henoch, R. Hertenberger, W. H.A. Hesselink, A. Hillenbrand, M. Hoek, Y. Holler, B. Hommez, G. Iarygin, A. Ivanilov, A. Izotov, H. E. Jackson, A. Jgoun, R. Kaiser, E. Kinney, A. Kisselev, M. Kopytin, V. Korotkov, V. Kozlov, B. Krauss, V. G. Krivokhijine, L. Lagamba, L. Lapikás, A. Laziev, P. Lenisa, P. Liebing, L. A. Linden-Levy, K. Lipka, W. Lorenzon, H. Lu, J. Lu, S. Lu, X. Lu, B. Q. Ma, B. Maiheu, N. C.R. Makins, Y. Mao, B. Marianski, H. Marukyan, F. Masoli, V. Mexner, N. Meyners, O. Mikloukho, C. A. Miller, Y. Miyachi, V. Muccifora, A. Nagaitsev, E. Nappi, Y. Naryshkin, A. Nass, M. Negodaev, W. D. Nowak, K. Oganessyan, H. Ohsuga, N. Pickert, S. Potashov, D. H. Potterveld, M. Raithel, D. Reggiani, P. E. Reimer, A. Reischl, A. R. Reolon, C. Riedl, K. Rith, G. Rosner, A. Rostomyan, L. Rubacek, J. Rubin, D. Ryckbosch, Y. Salomatin, I. Sanjiev, I. Savin, A. Schäfer, C. Schill, G. Schnell, K. P. Schüler, J. Seele, R. Seidl, B. Seitz, R. Shanidze, C. Shearer, T. A. Shibata, V. Shutov, M. C. Simani, K. Sinram, M. Stancari, M. Statera, E. Steffens, J. J.M. Steijger, H. Stenzel, J. Stewart, F. Stinzing, U. Stösslein, P. Tait, H. Tanaka, S. Taroian, B. Tchuiko, A. Terkulov, A. Tkabladze, A. Trzcinski, M. Tytgat, A. Vandenbroucke, P. van der Nat, G. van der Steenhoven, M. C. Vetterli, V. Vikhrov, M. G. Vincter, C. Vogel, M. Vogt, J. Volmer, C. Weiskopf, J. Wendland, J. Wilbert, G. Ybeles Smit, Y. Ye, Z. Ye, S. Yen, W. Yu, B. Zihlmann, H. Zohrabian, P. Zupranski

Research output: Contribution to journal › Article › peer-review

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	https://doi.org/10.1016/j.physletb.2004.01.079
State	Published - Apr 15 2004
Externally published	Yes

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

Online availability

10.1016/j.physletb.2004.01.079

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Cite this

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., ... Zupranski, P. (2004). Evidence for a narrow |S| = 1 baryon state at a mass of 1528 MeV in quasi-real photoproduction. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 585(3-4), 213-222. https://doi.org/10.1016/j.physletb.2004.01.079

Airapetian, A, Akopov, N, Akopov, Z, Amarian, M, Ammosov, VV, Andrus, A, Aschenauer, EC, Augustyniak, W, Avakian, R, Avetissian, A, Avetissian, E, Bailey, P, Balin, D, Baturin, V, Beckmann, M, Belostotski, S, Bernreuther, S, Bianchi, N, Blok, HP, Böttcher, H, Borissov, A, Borysenko, A, Bouwhuis, M, Brack, J, Brüll, A, Bryzgalov, V, Capitani, GP, Chen, T, Chen, X, Chiang, HC, Ciullo, G, Contalbrigo, M, Dalpiaz, PF, 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, LG, Gregor, IM, Hafidi, K, Hartig, M, Hasch, D, Heesbeen, D, Henoch, M, Hertenberger, R, Hesselink, WHA, Hillenbrand, A, Hoek, M, Holler, Y, Hommez, B, Iarygin, G, Ivanilov, A, Izotov, A, Jackson, HE, Jgoun, A, Kaiser, R, Kinney, E, Kisselev, A, Kopytin, M, Korotkov, V, Kozlov, V, Krauss, B, Krivokhijine, VG, Lagamba, L, Lapikás, L, Laziev, A, Lenisa, P, Liebing, P, Linden-Levy, LA, Lipka, K, Lorenzon, W, Lu, H, Lu, J, Lu, S, Lu, X, Ma, BQ, Maiheu, B, Makins, NCR, Mao, Y, Marianski, B, Marukyan, H, Masoli, F, Mexner, V, Meyners, N, Mikloukho, O, Miller, CA, Miyachi, Y, Muccifora, V, Nagaitsev, A, Nappi, E, Naryshkin, Y, Nass, A, Negodaev, M, Nowak, WD, Oganessyan, K, Ohsuga, H, Pickert, N, Potashov, S, Potterveld, DH, Raithel, M, Reggiani, D, Reimer, PE, Reischl, A, Reolon, AR, 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, KP, Seele, J, Seidl, R, Seitz, B, Shanidze, R, Shearer, C, Shibata, TA, Shutov, V, Simani, MC, Sinram, K, Stancari, M, Statera, M, Steffens, E, Steijger, JJM, 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, MC, Vikhrov, V, Vincter, MG, 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 2004, 'Evidence for a narrow |S| = 1 baryon state at a mass of 1528 MeV in quasi-real photoproduction', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 585, no. 3-4, pp. 213-222. https://doi.org/10.1016/j.physletb.2004.01.079

@article{727c73ea69844eafba16967c2e8d8056,

title = "Evidence for a narrow |S| = 1 baryon state at a mass of 1528 MeV in quasi-real photoproduction",

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 +(uudd{\=s}) 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.",

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",

author = "A. Airapetian and N. Akopov and Z. Akopov and M. Amarian and Ammosov, {V. V.} and A. Andrus and Aschenauer, {E. C.} and W. Augustyniak and R. Avakian and A. Avetissian and E. Avetissian and P. Bailey and D. Balin and V. Baturin and M. Beckmann and S. Belostotski and S. Bernreuther and N. Bianchi and Blok, {H. P.} and H. B{\"o}ttcher and A. Borissov and A. Borysenko and M. Bouwhuis and J. Brack and A. Br{\"u}ll and V. Bryzgalov and Capitani, {G. P.} and T. Chen and X. Chen and Chiang, {H. C.} and G. Ciullo and M. Contalbrigo and Dalpiaz, {P. F.} and W. Deconinck and {de Leo}, R. and {de Nardo}, L. and {de Sanctis}, E. and E. Devitsin and {di Nezza}, P. and M. D{\"u}ren and M. Ehrenfried and A. Elalaoui-Moulay and G. Elbakian and F. Ellinghaus and U. Elschenbroich and J. Ely and R. Fabbri and A. Fantoni and A. Fechtchenko and L. Felawka and B. Fox and S. Frullani and G. Gapienko and V. Gapienko and F. Garibaldi and K. Garrow and E. Garutti and D. Gaskell and G. Gavrilov and V. Gharibyan and G. Graw and O. Grebeniouk and Greeniaus, {L. G.} and Gregor, {I. M.} and K. Hafidi and M. Hartig and D. Hasch and D. Heesbeen and M. Henoch and R. Hertenberger and Hesselink, {W. H.A.} and A. Hillenbrand and M. Hoek and Y. Holler and B. Hommez and G. Iarygin and A. Ivanilov and A. Izotov and Jackson, {H. E.} and A. Jgoun and R. Kaiser and E. Kinney and A. Kisselev and M. Kopytin and V. Korotkov and V. Kozlov and B. Krauss and Krivokhijine, {V. G.} and L. Lagamba and L. Lapik{\'a}s and A. Laziev and P. Lenisa and P. Liebing and Linden-Levy, {L. A.} and K. Lipka and W. Lorenzon and H. Lu and J. Lu and S. Lu and X. Lu and Ma, {B. Q.} and B. Maiheu and Makins, {N. C.R.} and Y. Mao and B. Marianski and H. Marukyan and F. Masoli and V. Mexner and N. Meyners and O. Mikloukho and Miller, {C. A.} and Y. Miyachi and V. Muccifora and A. Nagaitsev and E. Nappi and Y. Naryshkin and A. Nass and M. Negodaev and Nowak, {W. D.} and K. Oganessyan and H. Ohsuga and N. Pickert and S. Potashov and Potterveld, {D. H.} and M. Raithel and D. Reggiani and Reimer, {P. E.} and A. Reischl and Reolon, {A. R.} and C. Riedl and K. Rith and G. Rosner and A. Rostomyan and L. Rubacek and J. Rubin and D. Ryckbosch and Y. Salomatin and I. Sanjiev and I. Savin and A. Sch{\"a}fer and C. Schill and G. Schnell and Sch{\"u}ler, {K. P.} and J. Seele and R. Seidl and B. Seitz and R. Shanidze and C. Shearer and Shibata, {T. A.} and V. Shutov and Simani, {M. C.} and K. Sinram and M. Stancari and M. Statera and E. Steffens and Steijger, {J. J.M.} and H. Stenzel and J. Stewart and F. Stinzing and U. St{\"o}sslein and P. Tait and H. Tanaka and S. Taroian and B. Tchuiko and A. Terkulov and A. Tkabladze and A. Trzcinski and M. Tytgat and A. Vandenbroucke and {van der Nat}, P. and {van der Steenhoven}, G. and Vetterli, {M. C.} and V. Vikhrov and Vincter, {M. G.} and C. Vogel and M. Vogt and J. Volmer and C. Weiskopf and J. Wendland and J. Wilbert and {Ybeles Smit}, G. and Y. Ye and Z. Ye and S. Yen and W. Yu and B. Zihlmann and H. Zohrabian and P. Zupranski",

note = "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 f{\"u}r 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.",

year = "2004",

month = apr,

day = "15",

doi = "10.1016/j.physletb.2004.01.079",

language = "English (US)",

volume = "585",

pages = "213--222",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "3-4",

}

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

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U2 - 10.1016/j.physletb.2004.01.079

DO - 10.1016/j.physletb.2004.01.079

M3 - Article

AN - SCOPUS:4344711281

SN - 0370-2693

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

IS - 3-4

ER -

Evidence for a narrow |S| = 1 baryon state at a mass of 1528 MeV in quasi-real photoproduction

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