Search for the Θ(1540) in lattice QCD
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چکیده
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 12 × 24 lattice with a lattice spacing of a = 0.148 fm, 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
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John von Neumann Institute for Computing Search for a New Kind of Particles: The Θ(1540) in Lattice QCD
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تاریخ انتشار 2006