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  • Evidence for a narrow |S|=1...
    Airapetian, A.; Amarian, M.; Andrus, A.; Avakian, R.; Avetissian, A.; Balin, D.; Beckmann, M.; Blok, H.P.; Böttcher, H.; Bouwhuis, M.; Brack, J.; Bryzgalov, V.; Capitani, G.P.; Chiang, H.C.; Ciullo, G.; Contalbrigo, M.; Dalpiaz, P.F.; Devitsin, E.; Elalaoui-Moulay, A.; Elbakian, G.; Ely, J.; Fabbri, R.; Fantoni, A.; Fechtchenko, A.; Felawka, L.; Frullani, S.; Gapienko, V.; Garibaldi, F.; Garutti, E.; Gaskell, D.; Grebeniouk, O.; Greeniaus, L.G.; Hartig, M.; Hasch, D.; Heesbeen, D.; Hesselink, W.H.A.; Hillenbrand, A.; Hommez, B.; Ivanilov, A.; Izotov, A.; Jackson, H.E.; Jgoun, A.; Kaiser, R.; Kisselev, A.; Kopytin, M.; Krivokhijine, V.G.; Lapikás, L.; Lenisa, P.; Lorenzon, W.; Lu, H.; Lu, J.; Lu, S.; Ma, B.-Q.; Makins, N.C.R.; Marianski, B.; Marukyan, H.; Masoli, F.; Mikloukho, O.; Miller, C.A.; Miyachi, Y.; Muccifora, V.; Nagaitsev, A.; Nappi, E.; Naryshkin, Y.; Nowak, W.-D.; Ohsuga, H.; Pickert, N.; Potterveld, D.H.; Reggiani, D.; Reimer, P.E.; Reolon, A.R.; Riedl, C.; Rosner, G.; Rubin, J.; Savin, I.; Schill, C.; Schnell, G.; Schüler, K.P.; Seidl, R.; Shanidze, R.; Shibata, T.-A.; Shutov, V.; Simani, M.C.; Stancari, M.; Steijger, J.J.M.; Stewart, J.; Stösslein, U.; Tait, P.; Taroian, S.; Tchuiko, B.; Trzcinski, A.; Tytgat, M.; Vandenbroucke, A.; Wendland, J.; Wilbert, J.; Ybeles Smit, G.; Ye, Z.; Yen, S.; Zihlmann, B.; Zupranski, P.

    Physics letters. B, 04/2004, Letnik: 585, Številka: 3-4
    Journal Article

    Evidence for a narrow baryon state is found in quasi-real photoproduction on a deuterium target through the decay channel pK0S→pπ+π−. A peak is observed in the pK0S  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.