A determination of the excited energy eigenstates of the nucleon, s=c12, I=12, N±, is presented in full QCD using 2+1 flavor PACS-CS gauge configurations. The correlation-matrix method is used and is built using standard nucleon interpolators employing smearings at the fermion sources and sinks. We develop and demonstrate a new technique that allows the eigenvectors obtained to be utilized to track the propagation of the intrinsic nature of energy-states from one quark mass to the next. This approach is particularly useful for larger dimension correlation matrices where more near-degenerate energy-states can appear in the spectrum.
@article{arxiv.1302.2987,
title = {Structure and Flow of the Nucleon Eigenstates in Lattice QCD},
author = {M. Selim Mahbub and Waseem Kamleh and Derek B. Leinweber and Peter J. Moran and Anthony G. Williams},
journal= {arXiv preprint arXiv:1302.2987},
year = {2013}
}