出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report on a study of the pentaquark Q+(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=0:148 fm, do
not provide any evidence for the existence of a Q+ 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.
