Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2005-04-27
Phys.Lett. B623 (2005) 208-217
Physics
High Energy Physics
High Energy Physics - Lattice
15 pages, 5 figures included, typos corrected, and references added
Scientific paper
10.1016/j.physletb.2005.07.026
We study the mass spectra of excited baryons with the use of the lattice QCD simulations. We focus our attention on the problem of the level ordering between the positive-parity excited state N'(1440) (the Roper resonance) and the negative-parity excited state N^*(1535). Nearly perfect parity projection is accomplished by combining the quark propagators with periodic and anti-periodic boundary conditions in the temporal direction. Then we extract the spectral functions from the lattice data by utilizing the maximum entropy method. We observe that the masses of the N' and N^* states are close for wide range of the quark masses (M_pi=0.61-1.22 GeV), which is in contrast to the phenomenological prediction of the quark models. The role of the Wilson doublers in the baryonic spectral functions is also studied.
Hatsuda Tetsuo
Sasaki Kiyoshi
Sasaki Shoichi
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