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A determination of the excited energy eigenstates of the nucleon,$s=c{1}{2}$, $I={1}{2}$, $N^{\pm}$, is presented in full QCD using 2+1 flavorPACS-CS gauge configurations. The correlation-matrix method is used and isbuilt using standard nucleon interpolators employing smearings at the fermionsources and sinks. We develop and demonstrate a new technique that allows theeigenvectors obtained to be utilized to track the propagation of the intrinsicnature of energy-states from one quark mass to the next. This approach isparticularly useful for larger dimension correlation matrices where morenear-degenerate energy-states can appear in the spectrum.

Structure and Flow of the Nucleon Eigenstates in Lattice QCD