Search for a Stable Six-Quark State at BABAR

Abstract

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 Upsilon -> S anti-Lambda anti-Lambda decays based on a sample of 90 million Upsilon(2S) and 110 million Upsilon(3S) decays collected by the BABAR experiment. No signal is observed, and 90% confidence level limits on the combined Upsilon(2S,3S) -> S anti-Lambda anti-Lambda branching fraction in the range (1.2-1.4)x10^-7 are derived for m_S < 2.05 GeV. These bounds set stringent limits on the existence of such exotic particles.

arXiv comment7 pages, 4 figures, published version

References in corpus (9)

• The BABAR Detector
• Limits and Confidence Intervals in the Presence of Nuisance Parameters
• Light Nuclei and Hypernuclei from Quantum Chromodynamics in the Limit of SU(3) Flavor Symmetry
• Study of e+e- --> Lambda anti-Lambda, Lambda anti-Sigma0, Sigma0 anti-Sigma0 using Initial State Radiation with BABAR
• Search for an H-dibaryon with mass near 2m_Lambda in Y(1S) and Y(2S) decays
• Search for the Weak Decay of an H Dibaryon
• Search for the Weak Decay of a Lightly Bound H Dibaryon
• Dark Matter in the Standard Model?
• Stable Sexaquark

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• Light baryonium spectrum
• The Scalar Hexaquark $uuddss$: a Candidate to Dark Matter?
• Higgs-Confinement Transitions in QCD from Symmetry Protected Topological Phases
• On the cosmology and terrestrial signals of sexaquark dark matter
• Hypernuclear constraints on the existence and lifetime of a deeply bound $H$ dibaryon
• Thermal production of sexaquarks in heavy-ion collisions
• Experimental review of the ${\rm Y}(1S,2S,3S)$ physics at $e^{+}{e}^{-}$ colliders and the LHC
• An unusual transient following the short GRB 071227
• Coalescence production of sexaquark with three diquarks in high-energy nuclear collisions
• Multi-track Displaced Vertices at B-Factories
• Search for Dark Matter in Upsilon Decays at BABAR Experiment