Parity of Θ+(1540) from QCD sum rules

Su Houng Lee; Hungchong Kim; Youngshin Kwon

doi:10.1016/j.physletb.2005.01.029

Parity of Θ⁺(1540) from QCD sum rules

Su Houng Lee, Hungchong Kim, Youngshin Kwon

Department of Physics

Research output: Contribution to journal › Article

27 Citations (Scopus)

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
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	https://doi.org/10.1016/j.physletb.2005.01.029
Publication status	Published - 2005 Mar 10

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All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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

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AB - 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.

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10.1016/j.physletb.2005.01.029