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A study of pentaquarks on the lattice with overlap fermions

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arxiv hep-ph/0406196 v3 pith:OPIFKXGY submitted 2004-06-17 hep-ph hep-latnucl-th

N. Mathur , F.X. Lee , A. Alexandru , C. Bennhold , Y. Chen , S.J. Dong , T. Draper , I. Horvath
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K.F. Liu S. Tamhankar J.B. Zhang
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classification hep-phhep-latnucl-th
keywords latticestatesboundcalculationchannelscheckedconsistentcontent
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abstract

We present a quenched lattice QCD calculation of spin-1/2 five-quark states with $uudd\bar{s}$ 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, 12^3 x 28 and 16^3 x 28, with the same lattice spacing of 0.2 fm, and pion mass as low as ~ 180 MeV.

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