Search for the pentaquark resonance signature in lattice QCD

Details Search for the pentaquark resonance signature in lattice QCD Search for the pentaquark resonance signature in lattice QCD

2005-03-10

arxiv.org/abs/hep-lat/0503008v1

Phys.Rev.D72:014502,2005

Physics

High Energy Physics

High Energy Physics - Lattice

42 pages, 28 figures, 11 tables

Scientific paper

10.1103/PhysRevD.72.014502

Claims concerning the possible discovery of the \Theta^+ pentaquark, with minimal quark content uudd\bar{s}, have motivated our comprehensive study into possible pentaquark states using lattice QCD. We review various 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 20^3 x 40 lattice in the quenched approximation. The standard lattice resonance signal of increasing attraction between baryon constituents for increasing quark mass is not observed for spin-1/2 pentaquark states. We conclude that evidence supporting the existence of a spin-1/2 pentaquark resonance does not exist in quenched QCD.

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