The B( B s )→ D (s) ( D ¯ (s) )T and D ∗ (s) ( D ¯ ∗ (s) )T decays in perturbative QCD approach
Abstract
In perturbative QCD approach, we investigate the
B(
B
s
)→
D
(s)
(
D
¯
(s)
)T
and
D
∗
(s)
(
D
¯
∗
(s)
)T
decays, which include the Cabibbo-Kobayashi-Maskawa (CKM) favored decays and the Cabibbo-Kobayashi-Maskawa-suppressed decays, where T denotes a light tensor meson. From our calculation, we find that the nonfactorizable emission diagrams and the annihilation type diagrams are important, especially for those color suppressed channels. For those decays with a tensor meson emitted, the factorizable emission diagrams vanish owing to the fact that a tensor meson can not be produced through the local (V-A) or tensor current. The numerical results show that the predictions for the branching ratios of considered charmed B decays are in the range of
10
−4
to
10
−6
for those CKM-favored decays (governed by
|
V
cb
|
) and in the range of
10
−5
to
10
−8
for those CKM-suppressed decays (governed by
|
V
ub
|
). We also predict large transverse polarization contributions in many of the
B(
B
s
)→
D
∗
(s)
(
D
¯
∗
(s)
)T
decay channels.