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 | |
| Publication status | Published - 2005 Mar 10 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
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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