Parity of $\Theta^+$(1540) from QCD sum rules
High Energy Physics - Phenomenology
2009-11-10 v2 Nuclear Theory
Abstract
The QCD sum rule for the pentaquark , 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 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 is negative remains valid.
Cite
@article{arxiv.hep-ph/0411104,
title = {Parity of $\Theta^+$(1540) from QCD sum rules},
author = {Su Houng Lee and Hungchong Kim and Youngshin Kwon},
journal= {arXiv preprint arXiv:hep-ph/0411104},
year = {2009}
}
Comments
slightly revised, version to appear in PLB