Study of CP Violating Effects in Time Dependent B 0 ( B 0 ¯ )→ D (∗)∓ π ± Decays
Abstract
We report measurements of time dependent decay rates for
B
0
(
B
¯
0
)→
D
(∗)∓
π
±
decays and extraction of CP violation parameters containing
ϕ
3
. Using fully reconstructed
D
(∗)
π
events from a
140
fb
−1
data sample collected at the
Υ(4S)
resonance, we obtain the CP violation parameters for
D
∗
π
and
Dπ
decays,
2
R
D
(∗)
π
sin(2
ϕ
1
+
ϕ
3
±
δ
D
(∗)
π
)
, where
R
D
(∗)
π
is the ratio of the magnitudes of the doubly-Cabibbo-suppressed and Cabibbo-favoured amplitudes, and
δ
D
(∗)
π
is the strong phase difference between them. Under the assumption of
δ
D
(∗)
π
being close to either 0 or
180
∘
, we obtain
|2
R
D
∗
π
sin(2
ϕ
1
+
ϕ
3
)|=0.060±0.040(stat)±0.019(sys)
and
|2
R
Dπ
sin(2
ϕ
1
+
ϕ
3
)|=0.061±0.037(stat)±0.018(sys)
.