Search for a Stable Six-Quark State at BABAR

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→S$\bar{Λ}\bar{Λ}$ decays based on a sampl...

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Veröffentlicht in:	Physical review letters 2019-02, Vol.122 (7)
Hauptverfasser:	Tisserand, V., Grauges, E., Eigen, G., Brown, D. N., Fritsch, M., Schroeder, T., Druzhinin, V. P., Golubev, V. B., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Solodov, E. P., Lankford, A. J., Lockman, W. S., Panduro Vazquez, W., Chao, D. S., Cheng, C. H., Echenard, B., Hitlin, D. G., Li, Y., Miyashita, T. S., Ongmongkolkul, P., Röhrken, M., Huard, Z., Bernard, D., Garzia, I., Santoro, V., Calcaterra, A., Patteri, P., Peruzzi, I. M., Lacker, H. M., Bhuyan, B., Prell, S., Arnaud, N., Wright, D. M., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Cowan, G., Griessinger, K., Schubert, K. R., Barlow, R. J., Lafferty, G. D., Dey, B., Cremaldi, L., Taras, P., De Nardo, G., Sciacca, C., Raven, G., Jessop, C. P., LoSecco, J. M., Gaz, A., Margoni, M., Posocco, M., Simi, G., Calderini, G., Marchiori, G., Biasini, M., Casarosa, G., Lusiani, A., Oberhof, B., Paoloni, E., Rama, M., Zani, L., Smith, A. J. S., Ferroni, F., Pilloni, A., Bünger, C., Dittrich, S., Voß, C., Vasseur, G., Aston, D., Dunwoodie, W., Ebert, M., Field, R. C., Graham, M. T., Hast, C., Kim, P., Luitz, S., Roodman, A., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Ahmed, H., Bellis, M., Puccio, E. M. T., Ernst, J. A., Schwitters, R. F., Bianchi, F., Beaulieu, A., Kowalewski, R., Lueck, T., Nugent, I. M., Roney, J. M., Sobie, R. J., Tasneem, N., Gershon, T. J., Harrison, P. F., Latham, T. E.
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Sprache:	eng
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Zusammenfassung:	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→S$\bar{Λ}\bar{Λ}$ decays based on a sample of 90×10$^{6}$Υ(2S) and 110×106Υ(3S) decays collected by the BABAR experiment. No signal is observed, and 90% confidence level limits on the combined Υ(2S,3S) → S$\bar{Λ}\bar{Λ}$ branching fraction in the range (1.2-1.4) × 10-7 are derived for mS < 2.05 GeV. These bounds set stringent limits on the existence of such exotic particles.
ISSN:	0031-9007 1079-7114