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Search for a Stable Six-Quark State at BABAR.

J P Lees1, V Poireau1, V Tisserand1

  • 1Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.

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Scientists searched for a deeply bound six-quark state, a potential dark matter candidate, using BABAR data. No signal was observed, setting stringent limits on the existence of this exotic particle.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Nuclear Physics

Background:

  • Recent theories propose a stable, deeply bound six-quark state (S) with composition uuddss.
  • This exotic particle is considered a potential dark matter candidate due to its unique properties.

Purpose of the Study:

  • To conduct the first experimental search for a stable, doubly strange six-quark state (S).
  • To investigate the potential existence of S by analyzing specific particle decays.

Main Methods:

  • Analysis of ϒ(2S) and ϒ(3S) decays collected by the BABAR experiment.
  • Searched for the decay signature ϒ→SΛ[over ¯]Λ[over ¯] to detect the hypothetical S particle.

Main Results:

  • No statistically significant signal for the deeply bound six-quark state (S) was observed.
  • 90% confidence level limits on the branching fraction for ϒ(2S,3S)→SΛ[over ¯]Λ[over ¯] were established between 1.2×10⁻⁷ and 1.4×10⁻⁷ for S masses below 2.05 GeV.

Conclusions:

  • The study places stringent limits on the existence of the predicted deeply bound, doubly strange six-quark state (S).
  • These findings constrain theoretical models proposing such exotic particles as dark matter candidates.