Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of Nonleptonic $B^{\ast}_{(s)}\to M_1 M_2$ $(M=D$, $D_s$, $\pi$,
  $K)$ Weak Decays with Factorization Approach   Motivated by the experiments of heavy flavor physics at running LHC and
upgrading SuperKEKB/Belle-II in the future, the nonleptonic $B^{\ast}_{(s)}\to
M_1 M_2$ $(M=D$, $D_s$, $\pi$, $K)$ weak decays are studied in this paper. The
amplitudes are calculated with factorization approach, and the transition form
factors $A_0^{B^{\ast}_{(s)}\to M_1}(0)$ are evaluated within BSW model. With
the reasonable approximation $\Gamma_{tot}(B^*_{(s)})\simeq \Gamma(B^*_{(s)}\to
B_{(s)}\gamma)$, our predictions of branching fractions are presented.
Numerically, the CKM-favored tree-dominated $\bar{B}^{*0} \to D^+D^-_s$ and
$\bar{B}^{*0}_s \to D^+_sD^-_s$ decays have the largest branching fractions of
the order $\sim{\cal O}(10^{-8})$, and hence will be firstly observed by
forthcoming Belle-II experiment. However, most of the other decay modes have
the branching fractions~$<{\cal O}(10^{-9})$ and thus are hardly to be observed
soon. Besides, for the possible detectable $B^{\ast}_{(s)}$ decays with
branching fractions $\gtrsim{\cal O}(10^{-9})$, some useful ratios, such as
$R_D$ {\it et al.,} are presented and discussed in detail.

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The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
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The categories of this paper are: eess
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin