Spin 3/2 Pentaquark Resonance Signature in Lattice QCD

Details Spin 3/2 Pentaquark Resonance Signature in Lattice QCD Spin 3/2 Pentaquark Resonance Signature in Lattice QCD

2005-04-18

arxiv.org/abs/hep-lat/0504015v2

Phys.Rev.D72:074507,2005

Physics

High Energy Physics

High Energy Physics - Lattice

23 pages, 23 figures

Scientific paper

10.1103/PhysRevD.72.074507

The possible discovery of the Theta+ pentaquark has motivated a number of studies of its nature using lattice QCD. While all the analyses thus far have focussed on spin-1/2 states, here we report the results of the first exploratory study in quenched lattice QCD of pentaquarks with spin 3/2. For the spin-3/2 interpolating field we use a product of the standard N and K* operators. We do not find any evidence for the standard lattice resonance signature of attraction (i.e., binding at quark masses near the physical regime) in the J^P = 3/2- channel. Some evidence of binding is inferred in the isoscalar 3/2+ channel at several quark masses, in accord with the standard lattice resonance signature. This suggests that this is a good candidate for the further study of pentaquarks on the lattice.

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