A study of pentaquarks on the lattice with overlap fermions
Abstract
We present a quenched lattice QCD calculation of spin-1/2 five-quark states with uudds quark content for both positive and negative parities. We do not observe any bound pentaquark state in these channels for either I = 0 or I =1. The states we found are consistent with KN scattering states which are checked to exhibit the expected volume dependence of the spectral weight. The results are based on overlap-fermion propagators on two lattices, 123 x 28 and 163 x 28, with the same lattice spacing of 0.2 fm, and pion mass as low as ~ 180 MeV.
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