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Type: Journal article
Title: Search for the pentaquark resonance signature in lattice QCD
Author: Lasscock, B.
Hedditch, J.
Kamleh, W.
Leinweber, D.
Melnitchouk, W.
Thomas, A.
Williams, A.
Young, R.
Zanotti, J.
Citation: Physical Review. D. Particles, Fields, Gravitation and Cosmology, 2005; 72(1):014502-1-014502-22
Publisher: American Physical Soc
Issue Date: 2005
ISSN: 1550-7998
Statement of
B. G. Lasscock, J. Hedditch, W. Kamleh, D. B. Leinweber, W. Melnitchouk, A.W. Thomas, A. G.Williams, R. D. Young, and J. M. Zanotti.
Abstract: Claims concerning the possible discovery of the Θ+ pentaquark, with minimal quark content uudds̅ , have motivated our comprehensive study into possible pentaquark states using lattice QCD. We review various spin-1/2 pentaquark interpolating fields in the literature and create a new candidate ideal for lattice QCD simulations. Using these interpolating fields we attempt to isolate a signal for a five-quark resonance. Calculations are performed using improved actions on a large 203×40 lattice in the quenched approximation. The standard lattice resonance signal of binding at quark masses near the physical regime, observed for established baryon resonances, is not observed for spin-1/2 pentaquark states. Thus we find no evidence supporting the existence of a spin-1/2 pentaquark resonance in quenched QCD.
Rights: ©2005 American Physical Society
RMID: 0020050809
DOI: 10.1103/PhysRevD.72.014502
Appears in Collections:Special Research Centre for the Subatomic Structure of Matter publications

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