Evidence for the hadronic annihilation decay mode B
+
! D
+
s
is found with
greater than 3 signi cance. The branching fraction and CP asymmetry are measured to be
B(B
+
! D
+
s
) = 1:87
+1:25
0:73
(stat) 0:19 (syst) 0:32 (norm)
10
6
;
ACP
(B
+
! D
+
s
) = 0:01 0:41 (stat) 0:03 (syst):
The last uncertainty on B(B
+
! D
+
s
) is from the branching fractions of the B
+
! D
+
s
D
0
normalization mode and intermediate resonance decays. Upper limits are also set for
the branching fractions of the related decay modes B
+
(c)
! D
+
(s)
K
0
, B
+
(c)
! D
+
(s)
K
0
and
B
+
c ! D
+
s
, including the result B(B
+
! D
+
K
0
) < 1:8 10
6
at the 90% credibility level.
http://repository.vnu.edu.vn/handle/VNU_123/32861
http://repository.vnu.edu.vn/handle/VNU_123/32861
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