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  • Observation of an exotic S ...
    Schumacher, R A; Tedeschi, D J; Adams, G; Anciant, E; Audit, G; Avakian, H; Bagdasaryan, H; Battaglieri, M; Beard, K; Bektasoglu, M; Berman, B L; Bianchi, N; Boiarinov, S; Bouchigny, S; Bradford, R; Branford, D; Briscoe, W J; Butuceanu, C; Calarco, J R; Coleman, A; Cords, D; Crabb, D; Crannell, H; De Sanctis, E; Degtyarenko, P V; De Vita, R; Dhuga, K S; Djalali, C; Dodge, G E; Doughty, D; Dragovitsch, P; Dytman, S; Egiyan, H; Eugenio, P; Fatemi, R; Gavalian, G; Giovanetti, K L; Gordon, C I O; Guo, L; Gyurjyan, V; Hadjidakis, C; Hersman, F W; Hicks, R S; Hu, J; Ito, M M; Jenkins, D; Joo, K; Klein, F J; Klimenko, A V; Klusman, M; Kossov, M; Kramer, L H; Kuhn, S E; Kuhn, J; Lachniet, J; Lima, A; Manak, J J; McAleer, S; Meyer, C A; Mikhailov, K; Mirazita, M; Miskimen, R; Mokeev, V; Morand, L; Morrow, S; Muccifora, V; Murphy, L Y; Mutchler, G S; Napolitano, J; Nasseripour, R; Niccolai, S; Niyazov, R A; Nozar, M; Osipenko, M; Park, K; Philips, S A; Pivnyuk, N; Pocanic, D; Pogorelko, O; Polli, E; Pozdniakov, S; Preedom, B M; Protopopescu, D; Riccardi, G; Ripani, M; Ritchie, B G; Ronchetti, F; Rossi, P; Sharabian, Y G; Shaw, J; Sober, D I; Stoler, P; Suleiman, R; Tur, C; Ungaro, M; Vineyard, M F; Weller, H; Weygand, D P; Yegneswaran, A; Yun, J

    Physical review letters, 12/2003, Volume: 91, Issue: 25
    Journal Article

    In an exclusive measurement of the reaction gammad-->K(+)K(-)pn, a narrow peak that can be attributed to an exotic baryon with strangeness S=+1 is seen in the K(+)n invariant mass spectrum. The peak is at 1.542+/-0.005 GeV/c(2) with a measured width of 0.021 GeV/c(2) FWHM, which is largely determined by experimental mass resolution. The statistical significance of the peak is (5.2+/-0.6)sigma. The mass and width of the observed peak are consistent with recent reports of a narrow S=+1 baryon by other experimental groups.