Penta-Quark Anti-Decuplet in Anisotropic Lattice QCD
Abstract
The penta-quark(5Q) Theta^+(1540) is studied in anisotropic lattice QCD with renormalized anisotropy a_s/a_t=4 for a high-precision measurement. Both the positive and the negative parity 5Q baryons are studied using a non-NK type interpolating field with I=0 and J=1/2. After the chiral extrapolation, the lowest positive parity state is found at m_{Theta}\simeq 2.25 GeV, which is too heavy to be identified with Theta^+(1540). In the negative parity channel, the lowest energy state is found at m_{Theta}\simeq 1.75 GeV. Although it is rather close to the empirical value, it is considered to be an NK scattering state rather than a localized resonance state.
Cite
@article{arxiv.hep-lat/0409121,
title = {Penta-Quark Anti-Decuplet in Anisotropic Lattice QCD},
author = {N. Ishii and T. Doi and H. Iida and M. Oka and F. Okiharu and H. Suganuma},
journal= {arXiv preprint arXiv:hep-lat/0409121},
year = {2009}
}
Comments
Lattice2004(spectrum), A talk presented at Lattice 2004 (The XXII International Symposium on Lattice Field Theory), Fermi National Accelerator Laboratory, USA, 21-26 June 2004