Mass Spectra of Pentaquarks -- Overlap versus Wilson Fermions

Details Mass Spectra of Pentaquarks -- Overlap versus Wilson Fermions Mass Spectra of Pentaquarks -- Overlap versus Wilson Fermions

2005-09-29

arxiv.org/abs/hep-lat/0509175v1

PoS LAT2005:065,2006

Physics

High Energy Physics

High Energy Physics - Lattice

6 pages, Talk presented at Lattice 2005, Dublin, 25-30 July 2005

Scientific paper

We investigate the mass spectra of $\Theta^+(udud\bar s)$ 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 $\beta=6.1$ on the $20^3 \times 40$ 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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