The Exotic Baryon Theta^+(1540) on the Lattice

Details The Exotic Baryon Theta^+(1540) on the Lattice The Exotic Baryon Theta^+(1540) on the Lattice

2005-09-23

arxiv.org/abs/hep-lat/0509109v1

PoS LAT2005 (2005) 026

Physics

High Energy Physics

High Energy Physics - Lattice

6 pages, 1 figure, Proceedings of "Lattice 2005" (Dublin, 25-30 July 2005)

Scientific paper

We report on a study of the pentaquark Theta^+(1540), using a variety of different interpolating fields. We use Chirally Improved fermions in combination with Jacobi smeared quark sources to improve the signal and get reliable results even for small quark masses. The results of our quenched calculations, which have been done on a 12^3x24 lattice with a lattice spacing of a=0.148 fm, do not provide any evidence for the existence of a Theta^+ with positive parity. We do observe, however, a signal compatible with nucleon-kaon scattering state. For the negative parity the results are inconclusive, due to the potential mixture with nucleon-kaon and N*-kaon scattering states.

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