Spin 3/2 Pentaquark Resonance Signature in Lattice QCD

Abstract

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.

arXiv comment23 pages, 23 figures

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Cited by in corpus (14)

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• Isolating Excited States of the Nucleon in Lattice QCD
• Multiparticle States and the Hadron Spectrum on the Lattice
• Positive-parity Excited-states of the Nucleon in Quenched Lattice QCD
• Isolating the Roper Resonance in Lattice QCD
• Ordering of Spin-$\frac{1}{2}$ Excitations of the Nucleon in Lattice QCD
• Even parity excitations of the nucleon in lattice QCD
• Absence of evidence for pentaquarks on the lattice
• Possible quantum numbers of the pentaquark Θ^+(1540) in QCD sum rules
• Spin-3/2 Pentaquark in QCD Sum Rules
• Positive parity pentaquark towers in large Nc QCD
• P-wave Pentaquark and its Decay in the Quark Model with Instanton Induced Interaction
• Revisiting the pentaquark episode for lattice QCD
• Baryon Spectroscopy and the Constituent Quark Model