出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Energies for excited light baryons are computed in quenched QCD with a pion mass of 490MeV.
Operators used in the simulations include local operators and the simplest nonlocal operators that
have nontrivial orbital structures. All operators are designed with the use of Clebsch-Gordan
coefficients of the octahedral group so that they transform irreducibly under the group rotations.
Matrices of correlation functions are computed for each irreducible representation, and then the
variational method is applied to separate mass eigenstates. We obtained 17 states for isospin 1/2
and 11 states for isospin 3/2 in various spin-parity channels including JP = 5/2±. The pattern
of the lowest-lying energies from each irrep is discussed. We use anisotropic lattices of volume
243×64 with temporal lattice spacing a−1
t = 6.05GeV with renormalized anisotropy x = 3.0.
