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arXiv · hep-ph/0411104

Parity of $Θ^+$(1540) from QCD sum rules

Su Houng Lee·Hungchong Kim·Youngshin Kwon
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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.

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Su Houng Lee, Hungchong Kim, Youngshin Kwon. 2005-01-13. Parity of $Θ^+$(1540) from QCD sum rules. https://doi.org/10.1016/j.physletb.2005.01.029

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