The cross sections for the reactions e+e−→ϕη, ϕη′, ρη, ρη′ have been measured using a data sample of 516 fb−1 collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. The ...corresponding values of the cross sections are: 1.4±0.4±0.1 fb (ϕη), 5.3±1.1±0.4 fb (ϕη′), 3.1±0.5±0.1 fb (ρη) and 3.3±0.6±0.2 fb (ρη′). The energy dependence of the cross sections is presented using Belle measurements together with those of CLEO and BaBar.
We report results from a study of the charmed double strange baryons
Ω
c
0
and
Ω
c
∗
0
at Belle. The
Ω
c
0
is reconstructed using the
Ω
c
0
→
Ω
−
π
+
decay mode, and its mass is measured to be
(
...2693.6
±
0.3
−1.5
+1.8
)
MeV
/
c
2
. The
Ω
c
∗
0
baryon is reconstructed in the
Ω
c
0
γ
mode. The mass difference
M
Ω
c
∗
0
−
M
Ω
c
0
is measured to be
(
70.7
±
0.9
−0.9
+0.1
)
MeV
/
c
2
. The analysis is performed using 673 fb
−1 of data on and near the
ϒ
(
4
S
)
collected with the Belle detector at the KEKB asymmetric-energy
e
+
e
−
collider.
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