Penta-quark in Anisotropic Lattice QCD

Details Penta-quark in Anisotropic Lattice QCD Penta-quark in Anisotropic Lattice QCD

2005-01-24

arxiv.org/abs/hep-lat/0501022v2

Nucl.Phys. A755 (2005) 467-470

Physics

High Energy Physics

High Energy Physics - Lattice

A talk presented at 10th International Conference BARYONS04, Ecole Polytechnique, Palaiseau, France, 25-29, Oct 2004; A single

Scientific paper

Penta-quark (5Q) baryons are studied using anisotropic lattice QCD for high-precision measurement of temporal correlators. A non-NK-type interpolating field is employed to study the 5Q states with J^P=1/2^{\pm} and I=0. In J^P=1/2^+ channel, the lowest-lying state is found at m_{5Q} \simeq 2.25 GeV, which is too massive to be identified as the Theta^+(1540). In J^P=1/2^- channel, the lowest-lying state is found at m_{5Q} \simeq 1.75 GeV. To distinguish a compact 5Q resonance state from an NK scattering state, a new method with ``hybrid boundary condition (HBC)'' is proposed. As a result of the HBC analysis, the observed state in the negative-parity channel turns out to be an $NK$ scattering state.

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