Nucleon excitation mass spectrum
- Solid boxes show the masses of the nucleon stationary
states in a cubic box having periodic boundary conditions. Vertical extents
indicate statistical uncertainties from the Monte Carlo computations.
Hollow boxes show thresholds above which multi-hadron states are expected.
- Nf=2 flavors of light quarks on a 243 by
64 lattice using an anisotropic clover fermion action, with spatial
lattice spacing as~0.11 fm and anisotropy
- Left panel: light quark masses are such that the pion mass is 580 MeV.
- Right panel: light quark masses are such that pion mass is 420 MeV.