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Lees, J P; Tisserand, V; Schroeder, T; Mattison, T S; McKenna, J A; Blinov, V E; Druzhinin, V P; Serednyakov, S I; Skovpen, Yu I; Todyshev, K Yu; Gary, J W; Long, O; Panduro Vazquez, W; Cheng, C H; Echenard, B; Kim, J; Li, Y; Ongmongkolkul, P; Huard, Z; Meadows, B T; Sun, L; Wagner, S R; Verderi, M; Bettoni, D; Calabrese, R; Fioravanti, E; Santoro, V; Peruzzi, I M; Zallo, A; Patrignani, C; Mallik, U; Gritsan, A V; Arnaud, N; Davier, M; Le Diberder, F; Lutz, A M; Lange, D J; Coleman, J P; Davis, C L; Schubert, K R; Barlow, R J; Lafferty, G D; Jawahery, A; Robertson, S H; Neri, N; Summers, D J; Taras, P; De Nardo, G; Jessop, C P; Kass, R; Margoni, M; Akar, S; Ben-Haim, E; Calderini, G; Ocariz, J; Biasini, M; Manoni, E; Rossi, A; Carpinelli, M; Casarosa, G; Chrzaszcz, M; Paoloni, E; Rama, M; Rizzo, G; Ferrarotto, F; Pilloni, A; Bünger, C; Grünberg, O; Heß, M; Voß, C; Adye, T; Emery, S; Aston, D; Convery, M R; Dunwoodie, W; Field, R C; Fulsom, B G; Kim, P; Luitz, S; MacFarlane, D B; Muller, D R; Roodman, A; Va'vra, J; Purohit, M V; Ahmed, H; Burchat, P R; Ernst, J A; Guttman, N; Peimer, D R; Soffer, A; Spanier, S M; Izen, J M; Filippi, A; Albert, J; Kowalewski, R; Roney, J M; Gershon, T J; Harrison, P F; Prepost, R; Wu, S L
Physical review letters, 02/2019, Volume: 122, Issue: 7Journal Article
Recent investigations have suggested that the six-quark combination uuddss could be a deeply bound state (S) that has eluded detection so far, and a potential dark matter candidate. We report the first search for a stable, doubly strange six-quark state in ϒ→SΛover ¯Λover ¯ decays based on a sample of 90×10^{6}ϒ(2S) and 110×10^{6}ϒ(3S) decays collected by the BABAR experiment. No signal is observed, and 90% confidence level limits on the combined ϒ(2S,3S)→SΛover ¯Λover ¯ branching fraction in the range (1.2-1.4)×10^{-7} are derived for m_{S}<2.05 GeV. These bounds set stringent limits on the existence of such exotic particles.
