Pentaquarks in the Jaffe-Wilczek approximation

摘要

The masses of uudd (s) over bar, uudd (d) over bar, and uuss (d) over bar pentaquarks are evaluated in a framework of both the effective Hamiltonian approach to QCD and the spinless Salpeter equation using the Jaffe-Wilczek diquark approximation and the string interaction for the diquark-diquark-antiquark system. The pentaquark masses are found to be in the region above 2 GeV. That indicates that the Goldstone boson exchange effects may play an important role in the light pentaquarks. The same calculations yield the mass of [ud](2)(c) over bar pentaquark similar to 3250 MeV and [ud](2)(b) over bar pentaquark similar to 6509 MeV. (c) 2005 Pleiades Publishing, Inc.