Possibility of an axial vector isoscalar tetraquark with udsˉsˉ
is discussed. If the pentaquark Θ+(1540) has the
(qq)3ˉ(qq)3ˉqˉ configuration, the isoscalar
udsˉsˉ(ϑ+-meson) state with JP=1+ is expected to
exist in the mass region lower than or close to the mass of Θ+(1540).
Within a flux-tube quark model, a possible resonant state of
udsˉsˉ(JP=1+) is suggested to appear around 1.4 GeV with the
width O(20∼50) MeV. We propose that the ϑ+-meson is a
good candidate for the tetraquark search, which would be observed in the
K+K+π− decay channel.Comment: 20 pages, 5 figures, submitted to Phys.Rev.