Search for a stable six-quark state at BABAR
Lees, Jean-Pierre; Poireau, Vincent; Tisserand, Vincent; Grauges, Eugeni; Palano, Antimo; Eigen, Gerald; Brown, David Nathan; Kolomensky, Yury G.; Fritsch, Miriam; Koch, Helmut; Schroeder, Torsten; Hearty, Christopher; Mattison, Tom S.; McKenna, Janis A.; So, Rocky Y.; Blinov, Vladimir E.; Buzykaev, Alexey; Druzhinin, Vladimir P.; Golubev, Vladimir B.; Kozyrev, Evgeny A.; Kravchenko, Evgeniy A.; Onuchin, Alexei P.; Serednyakov, Sergey I.; Skovpen, Yuri I.; Solodov, Evgeni Petrovich; Todyshev, Korneliy Yu.; Lankford, Andrew J.; Gary, J. William; Long, Owen; Eisner, Alan M.; Lockman, William S.; Panduro-Vazquez, William; Chao, Daniel S.; Cheng, Chih-Hsiang; Echenard, Bertrand; Flood, Kevin T.; Hitlin, David G.; Kim, Jae; Lee, Myeongjae; Miyashita, Tomonari S.; Ongmongkolkul, Piti; Porter, Frank C.; Röhrken, Markus; Huard, Zachary; Meadows, Brian T.; Pushpawela, Buddhi G.; Sokoloff, Michael D.; Sun, Liang; Smith, Jim G.; Wagner, Stephen R.; BABAR, Collaboration
Journal article, Peer reviewed
Published version
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https://hdl.handle.net/11250/2725394Utgivelsesdato
2019Metadata
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- Department of Physics and Technology [2156]
- Registrations from Cristin [10237]
Originalversjon
10.1103/PhysRevLett.122.072002Sammendrag
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 → SΛ¯ Λ¯ decays based on a sample of 90 × 106ϒð2SÞ and 110 × 106ϒð3SÞ decays collected by the BABAR experiment. No signal is observed, and 90% confidence level limits on the combined ϒð2S; 3SÞ → SΛ¯ Λ¯ branching fraction in the range ð1.2–1.4Þ × 10−7 are derived for mS < 2.05 GeV. These bounds set stringent limits on the existence of such exotic particles.