Lattice QCD determination of states with spin 5/2 or higher in the spectrum of nucleons

Basak, S.; Edwards, R. G.; Fleming, G. T.; Lichtl, A.; Morningstar, C.; Ricards, D. G.; Sato, I.; Wallace, S. J.

Lattice QCD determination of states with spin 5/2 or higher in the spectrum of nucleons

Authors

Description

Energies for excited isospin 1/2 states that include the nucleon are computed using quenched, anisotropic lattices. Baryon interpolating field operators that are used include nonlocal operators that provide $G_2$ irreducible representations of the octahedral group. The decomposition of spin 5/2 or higher states is realized for the first time in a lattice QCD calculation. We observe patterns of degenerate energies in the irreducible representations of the octahedral group that correspond to the subduction of the continuum spin 5/2 or higher.
4 pages, 2 figures