Mass Spectra of Pentaquarks – Overlap versus Wilson Fermions
نویسندگان
چکیده
We investigate the mass spectra of Θ(ududs̄) in quenched lattice QCD, with overlap and Wilson fermions respectively. Using three different interpolating operators, we measure their correlation matrix, and extract the mass spectra in even and odd parity channels, for 100 gauge configurations generated with single plaquette action at β = 6.1 on the 203 × 40 lattice. The lowest 1/2− state agrees with the KN s-wave scattering state, for both fermion schemes. On the other hand, for the lowest 1/2+ state, it is different from any hadron scattering states for the overlap fermion, while it seems to agree with KN∗ s-wave for the Wilson fermion.
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تاریخ انتشار 2005