Observation of B 0 → D ∗− (5π ) + , B + → D ∗− (4π ) ++ and B + → D ¯ ∗0 (5π ) +
Abstract
We report the first observation of a number of decay modes of the B meson, namely
B
0
→
D
∗−
(5π
)
+
,
B
+
→
D
∗−
(4π
)
++
and
B
+
→
D
¯
∗0
(5π
)
+
, where
(nπ)
implies the combination of n charged pions. The analysis is based on a 140 fb
−1
data sample collected at the
Υ(4S)
resonance with the Belle detector at KEKB. We measure
B(
B
0
→
D
∗−
(5π
)
+
)=(4.72±0.59±0.71)×
10
−3
,
B(
B
+
→
D
∗−
(4π
)
++
=(2.56±0.26±0.33)×
10
−3
and
B(
B
+
→
D
¯
∗0
(5π
)
+
)=(5.67±0.91±0.85)×
10
−3
. We also provide improved measurements of the branching fractions for the decay modes
B
0
→
D
∗−
(3π
)
+
,
B
+
→
D
¯
∗0
(3π
)
+
and
B
0
→
D
¯
∗0
(4π
)
0
.