Abstract
The decays
B
0
¯
→
D
+
sJ
K
−
and
B
0
¯
→
D
−
sJ
π
+
are studied for the first time. A significant signal is observed in the
B
0
¯
→
D
∗
sJ
(2317
)
+
K
−
decay channel with
B(
B
0
¯
→
D
∗
sJ
(2317
)
+
K
−
)×B(
D
∗
sJ
(2317
)
+
→
D
+
s
π
0
)=(
5.3
+1.5
−1.3
±0.7±1.4)×
10
−5
. No signals are observed in the
B
0
¯
→
D
∗
sJ
(2317
)
−
π
+
,
B
0
¯
→
D
sJ
(2460
)
+
K
−
and
B
0
¯
→
D
sJ
(2460
)
−
π
+
decay modes, and upper limits are obtained. The analysis is based on a dataset of 140 fb
−1
collected by the Belle experiment at the asymmetric
e
+
e
−
collider KEKB.