Search for the pentaquark resonance signature in lattice QCD

Journal Article · Fri Jul 01 04:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.72.014502· OSTI ID:20711062

Lasscock, B G; Hedditch, J; Kamleh, W; Leinweber, D B; Williams, A G ^[1]; Melnitchouk, W ^[2]; Thomas, A W; Young, R D ^[1]; Zanotti, J M ^[1]

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1. Special Research Centre for the Subatomic Structure of Matter, and Department of Physics, University of Adelaide, Adelaide SA 5005 (Australia)
2. Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606 (United States)

Claims concerning the possible discovery of the {theta}{sup +} pentaquark, with minimal quark content uudds, 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 20{sup 3}x40 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.

• OSTI ID: 20711062
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 1 Vol. 72; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
COMPUTERIZED SIMULATION
GAUGE INVARIANCE
HYPERONS
LATTICE FIELD THEORY
QUANTUM CHROMODYNAMICS
QUARKS
RESONANCE PARTICLES
REST MASS
SPIN