２００１年度 東大駒場原子核理論セミナー

Nucleon Excited States in Lattice QCD

It is important to understand the hadron mass spectrum from the first principles of quantum chromodynamics (QCD), the fundamental theory of the strong interactions. As is well known, the only method for such a first-principle calculation is numerical lattice QCD. Recent lattice calculations of the light-hadron mass spectrum in the quenched approximation agree well with experimental values within about 5%. However, this success is restricted to ground states and does not apply to excited states. The excited-state mass spectrum is big challenge in lattice QCD. In this talk, I present a review of the current progress in lattice QCD spectroscopy of nucleon excited states.