Pentaquarks in the Jaffe-Wilczek approximation
I.M.Narodetskii, C.Semay, B.Silvestre-Brac, Yu.A.Simonov, M.A.Trusov
Abstract
The masses of
uudd
s
¯
,
uudd
d
¯
and
uuss
d
¯
pentaquarks are evaluated in a framework of both the Effective Hamiltonian approach to QCD and spinless Salpeter 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
¯
pentaquark
∼
3250 MeV and
[ud
]
2
b
¯
pentaquark
∼
6509 MeV.