Spin-32 pentaquark resonance signature in lattice QCD

B. G. Lasscock, D. B. Leinweber, W. Melnitchouk, A. W. Thomas, A. G. Williams, R. D. Young, and J. M. Zanotti
Phys. Rev. D 72, 074507 – Published 27 October 2005

Abstract

The possible discovery of the Θ+ pentaquark has motivated a number of studies of its nature using lattice QCD. While all the analyses thus far have focused on spin-12 states, here we report the results of the first exploratory study in quenched lattice QCD of pentaquarks with spin 32. For the spin-32 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 JP=32 channel. Some evidence of binding is inferred in the isoscalar 32+ 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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  • Received 18 April 2005

DOI:https://doi.org/10.1103/PhysRevD.72.074507

©2005 American Physical Society

Authors & Affiliations

B. G. Lasscock1, D. B. Leinweber1, W. Melnitchouk2, A. W. Thomas1,2, A. G. Williams1,2, R. D. Young1,2, and J. M. Zanotti1,3

  • 1Special Research Centre for the Subatomic Structure of Matter, and Department of Physics, University of Adelaide, Adelaide SA 5005, Australia
  • 2Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606 USA
  • 3John von Neumann-Institut für Computing NIC/DESY, 15738 Zeuthen, Germany

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Vol. 72, Iss. 7 — 1 October 2005

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