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Low-lying Odd-parity States of the Nucleon in Lattice QCD

The world's first examination of the odd-parity nucleon spectrum at light quark masses in 2+1 flavor lattice QCD is presented. Configurations generated by the PACS-CS collaboration and made available through the ILDG are used, with the lightest pion mass at 156 MeV. A novel method for tracking the individual energy eigenstates as the quark mass changes is introduced. The success of this approach reveals the flow of the states towards the physical masses. Using the correlation matrix method, the two lowest-energy states revealed are found to be in accord with the physical spectrum of Nature.

preprint2012arXivOpen access
M. Selim MahbubWaseem KamlehDerek B. LeinweberPeter J. MoranAnthony G. Williams
hep-lat
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M. Selim MahbubWaseem KamlehDerek B. LeinweberPeter J. MoranAnthony G. Williams

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