The masses of
uudd[`(s)],\text uudd[`(d)]uudd\bar s,{\text{ }}uudd\bar d
, and
uuss[`(d)]uuss\bar d
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)][ud]^2 \bar c
pentaquark ∼3250 MeV and
[ud]2 [`(b)][ud]^2 \bar b
pentaquark ∼6509 MeV.
From Yadernaya Fizika, Vol. 68, No. 3, 2005, pp. 564–568.
Original English Text Copyright © 2005 by Narodetskii, Semay, Silvestre-Brac, Simonov, Trusov.
This article was submitted by the authors in English.