### Abstract

The QCD sum rule for the pentaquark Θ^{+}, first analyzed by Sugiyama, Doi and Oka, is reanalyzed with a phenomenological side that explicitly includes the contribution from the two-particle reducible kaon-nucleon intermediate state. The magnitude for the overlap of the Θ^{+} interpolating current with the kaon-nucleon state is obtained by using soft-kaon theorem and a separate sum rule for the ground state nucleon with the pentaquark nucleon interpolating current. It is found that the K-N intermediate state constitutes only 10% of the sum rule so that the original claim that the parity of Θ+ is negative remains valid.

Original language | English |
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Pages (from-to) | 252-258 |

Number of pages | 7 |

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

Volume | 609 |

Issue number | 3-4 |

DOIs | |

Publication status | Published - 2005 Mar 10 |

### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

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## Cite this

Lee, S. H., Kim, H., & Kwon, Y. (2005). Parity of Θ

^{+}(1540) from QCD sum rules.*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*,*609*(3-4), 252-258. https://doi.org/10.1016/j.physletb.2005.01.029