Search for the Θ1540) in lattice QCD
Institut für theoretische Physik, Universität Regensburg, D-93040, Regensburg, Germany
* e-mail: firstname.lastname@example.org
Accepted: 24 July 2006
Published online: 29 August 2006
We report on a study of the pentaquark Θ+(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 123×24 lattice with a lattice spacing of a = 0.148fm, do not provide any evidence for the existence of a Θ+ 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.
PACS: 12.38.Gc Lattice QCD calculations –
© Società Italiana di Fisica and Springer-Verlag, 2006