出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Our recent first-principles lattice-QCD exploration of the excited states of the nucleon in the positive parity channel is presented. Of particular interest is the first positive-parity excitation of the nucleon; the Roper resonance. Using correlation-matrix methods developed by the CSSM Lattice Collaboration, a low-lying Roper state is observed in our full QCD analysis using the PACS-CS gauge fields made available via the ILDG. A method for tracing the quark-mass flow of energy eigenstates using the eigenvectors of the generalized eigenvalue equations is presented. The results for the Roper display significant curvature as the chiral regime is approached.
