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Published February 22, 2019 | Submitted + Published
Journal Article Open

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 → SΛΛ 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) → SΛΛ 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.

Additional Information

© 2019 Published by the American Physical Society. Received 14 November 2018; revised manuscript received 24 January 2019; published 22 February 2019. We thank G. Farrar for providing us with the theoretical model to simulate the signal and useful discussions. We are grateful for the extraordinary contributions of our PEP-II2 colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the US Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l'Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (Spain), the Science and Technology Facilities Council (United Kingdom), and the Binational Science Foundation (U.S.-Israel). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation (USA).

Attached Files

Published - PhysRevLett.122.072002.pdf

Submitted - 1810.04724.pdf


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