Spin-3/2 Nucleon and Delta Baryons in Lattice QCD
摘要
We present first results for masses of spin-3/2 N and Delta baryons in lattice QCD using Fat-Link Irrelevant Clover (FLIC) fermions. Spin-3/2 interpolating fields providing overlap with both spin-3/2 and spin-1/2 states are considered. In the isospin-1/2 sector, we observe, after appropriate spin and parity projection, a strong signal for the J^P=3/2^- state together with a weak but discernible signal for the 3/2^+ state with a mass splitting near that observed experimentally. We also find good agreement between the 1/2^+/- masses and earlier nucleon mass simulations with the standard spin-1/2 interpolating field. For the isospin-3/2 Delta states, clear mass splittings are observed between the various 1/2^+/- and 3/2^+/- channels, with the calculated level orderings in good agreement with those observed empirically.
引用
@article{arxiv.hep-lat/0304001,
title = {Spin-3/2 Nucleon and Delta Baryons in Lattice QCD},
author = {J. M. Zanotti and D. B. Leinweber and A. G. Williams and J. B. Zhang and W. Melnitchouk and S. Choe},
journal= {arXiv preprint arXiv:hep-lat/0304001},
year = {2008}
}
备注
17 pages, 8 figures, 2 tables