## Abstract

We derive an upper bound on the mass difference between the Ξ^{*} and Θ^{+} pentaquarks which are the manifestly exotic members of the SU(3)_{f} antidecuplet. The derivation is based on simple assumptions about SU(3)_{f} symmetry breaking and uses the standard quantum mechanical variational method. The resulting rather robust bound is more than 20 MeV below the experimentally reported Ξ^{*}-Θ^{+} mass difference, emphasizing the need for confirmation of the experimental mass values and placing strong constraints on quark models of the pentaquark structure.

Original language | English |
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Pages (from-to) | 273-276 |

Number of pages | 4 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 594 |

Issue number | 3-4 |

DOIs | |

State | Published - 5 Aug 2004 |

### Funding

Funders | Funder number |
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United States-Israel Binational Science Foundation | |

U.S. Department of Energy | |

United States-Israel Binational Science Foundation | |

Division of High Energy Physics | W-31-109-ENG-38 |

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