### Abstract

We construct a chiral Lagrangian for pentaquark baryons assuming that the recently found Θ+(1540) state belongs to an antidecuplet of SU(3) flavor symmetry with JP=12±. We derive the Gell-Mann-Okubo formulae for the antidecuplet baryon masses, and a possible mixing between the antidecuplet and the pentaquark octet. Then we calculate the cross sections for π-p→K-Θ+ and γn→K-Θ+ using our chiral Lagrangian. The resulting amplitudes respect the underlying chiral symmetry of QCD correctly. We also describe how to include the light vector mesons in the chiral Lagrangian.

Original language | English |
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Pages (from-to) | 87-92 |

Number of pages | 6 |

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

Volume | 611 |

Issue number | 1-2 |

DOIs | |

Publication status | Published - 2005 Mar 31 |

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

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## Cite this

Ko, P., Lee, J., Lee, T., & Park, J. H. (2005). Chiral perturbation theory for pentaquark baryons and its applications.

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*,*611*(1-2), 87-92. https://doi.org/10.1016/j.physletb.2005.02.031