Spin-(3/2) pentaquark resonance signature in lattice QCD

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

DOI:https://doi.org/10.1103/PhysRevD.72.074507· OSTI ID:20713659

Lasscock, B G; Leinweber, D B ^[1]; Melnitchouk, W ^[2]; Thomas, A W; Williams, A G; 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 USA (United States)

The possible discovery of the {theta}{sup +} pentaquark has motivated a number of studies of its nature using lattice QCD. While all the analyses thus far have focused 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{sup P}=(3/2){sup -} channel. Some evidence of binding is inferred in the isoscalar (3/2){sup +} 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.

• OSTI ID: 20713659
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 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
FIELD OPERATORS
HYPERONS
LATTICE FIELD THEORY
PARTICLE IDENTIFICATION
QUANTUM CHROMODYNAMICS
QUARKS
RESONANCE PARTICLES
SPIN