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  • Search for a narrow baryonic state decaying to ${pK^0_S}$ and ${\bar{p}K^0_S}$ in deep inelastic scattering at HERA
    ZEUS Collaboration; Abt, I; Adamczyk, L; Adamus, M; Antonelli, S; Aushev, V; Behrens, U; Bhadra, S; Boos, E. G; Brock, I; Bruni, A; Bussey, P. J; Caldwell, A; Catterall, C. D; Chwastowski, J; Ciborowski, J; Ciesielski, R; Corradi, M; Devenish, R. C. E; Dusini, S; Foster, B; Gach, G; Garfagnini, A; Geiser, A; Gizhko, A; Golubkov, Yu. A; Grzelak, G; Guzik, M; Gwenlan, C; Hain, W; Hlushchenko, O; Hochman, D; Hori, R; Iga, Y; Ishitsuka, M; Januschek, F; Jomhari, N. Z; Kananov, S; Karshon, U; Kaur, P; Kisielewska, D; Klanner, R; Klein, U; Korzhavina, I. A; Kotanski, A; Kovalchuk, N; Krupa, B; Kuprash, O; Kuze, M; Levchenko, B. B; Lisovyi, M; Lobodzinska, E; Loehr, B; Lohrmann, E; Longhin, A; Lontkovskyi, D; Makarenko, I; Mastroberardino, A; Idris, F. Mohamad; Nasir, N. Mohammad; Nobe, T; Nowak, R. J; Paul, E; Perlanski, W; Pokrovskiy, N. S; Polini, A; Przybycien, M; Roloff, P; Ruspa, M; Saxon, D. H; Schioppa, M; Schneekloth, U; Schoerner-Sadenius, T; Shkola, O; Shyrma, Yu; Singh, I; Skillicorn, I. O; Slominski, W; Solano, A; Stanco, L; Stefaniuk, N; Stern, A; Stopa, P; Sztuk-Dambietz, J; Tassi, E; Tokushuku, K; Tomaszewska, J; Tsurugai, T; Turcato, M; Turkot, O; Verbytskyi, A; Abdullah, W. A. T. Wan; Wichmann, K; Wing, M; Yamada, S; Yamazaki, Y; Zakharchuk, N; Zenaiev, O; Zhautykov, B. O; Zotkin, D. S

    04/2016
    Journal Article

    Phys. Lett. B 759 (2016) 446-453 A search for a narrow baryonic state in the $pK^0_S$ and $\bar{p}K^0_S$ system has been performed in $ep$ collisions at HERA with the ZEUS detector using an integrated luminosity of 358 pb$^{-1}$ taken in 2003-2007. The search was performed with deep inelastic scattering events at an $ep$ centre-of-mass energy of 318 GeV for exchanged photon virtuality, $Q^2$, between 20 and 100 $\rm{} GeV^{2}$. Contrary to evidence presented for such a state around 1.52 GeV in a previous ZEUS analysis using a sample of 121 pb$^{-1}$ taken in 1996-2000, no resonance peak was found in the $p(\bar{p})K^0_S$ invariant-mass distribution in the range 1.45-1.7 GeV. Upper limits on the production cross section are set.

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