AbstractWe study the CP violation in two-body nonleptonic decays of $$B_c$$
B
c
meson. We concentrate on the decay channels which contain at least one excited heavy meson in the final states. Specifically, the following channels are considered: $$B_c\rightarrow c{\bar{c}}(2S, 2P)+{\bar{c}}q(1S, 1P)$$
B
c
→
c
c
¯
(
2
S
,
2
P
)
+
c
¯
q
(
1
S
,
1
P
)
, $$B_c\rightarrow c{\bar{c}}(1S)+{\bar{c}}q(2S, 2P)$$
B
c
→
c
c
¯
(
1
S
)
+
c
¯
q
(
2
S
,
2
P
)
, $$B_c\rightarrow c{\bar{c}}(1P)+{\bar{c}}q(2S)$$
B
c
→
c
c
¯
(
1
P
)
+
c
¯
q
(
2
S
)
, $$B_c\rightarrow c{\bar{c}}(1D)+{\bar{c}}q(1S, 1P)$$
B
c
→
c
c
¯
(
1
D
)
+
c
¯
q
(
1
S
,
1
P
)
, and $$B_c\rightarrow c{\bar{c}}(3S)+{\bar{c}}q(1S)$$
B
c
→
c
c
¯
(
3
S
)
+
c
¯
q
(
1
S
)
. The improved Bethe-Salpeter method is applied to calculate the hadronic transition matrix element. Our results show that some decay modes have large branching ratios, which is of the order of $$10^{-3}$$
10
-
3
. The CP violation effect in $$B_c \rightarrow \eta _c(1S)+D(2S)$$
B
c
→
η
c
(
1
S
)
+
D
(
2
S
)
, $$B_c \rightarrow \eta _c(1S)+D_0^{*}(2P)$$
B
c
→
η
c
(
1
S
)
+
D
0
∗
(
2
P
)
, and $$B_c \rightarrow J/\psi +D^{*}(2S)$$
B
c
→
J
/
ψ
+
D
∗
(
2
S
)
are most likely to be found. If the detection precision of the CP asymmetry in such channels can reach the $$3\sigma $$
3
σ
level, at least $$10^7$$
10
7
$$B_c$$
B
c
events are needed.