Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of $D_{(s)}^\ast$ and their contributions in $B_{(s)}\to
  D_{(s)} h h^\prime$ decays   We demonstrate the roles of $D_{(s)}^\ast$ and their contributions in the
quasi-two-body decays $B_{(s)} \to D_{(s)} h h^\prime$ ($h, h^\prime = \{\pi,
K\}$) in the perturbative QCD approach, stemming from the quark flavour
changing $\bar{b} \to \bar{c} \, q_2 \, \bar{q}_1$ and $\bar{b} \to c \,
\bar{q_1} \, \bar{q_2}$ with $q_1, q_2 = \{s/d, u\}$. The main motivation of
this study is the measurements of significant derivations from the simple
phase-space model in the channels $B_{(s)} \to D_{(s)} h h^\prime$ at $B$
factories and LHC, which is now clarified as the Breit-Wigner-tail effects from
the corresponding intermediate resonant states $D_{(s)}^\ast$. We confirm that
these effect from $D^\ast$ is small ($\sim 5\%$) in the quasi-two-body $B_{(s)}
\to D \pi \pi (K)$ decaying channels, and predict the tiny ($< 1 \%$)
contributions from $D^\ast$ in the $B_{(s)} \to D_s K \pi (K)$ decaying
channels, our result for the $B_s \to D K \pi (K)$ decaying channels
contributed only from the Breit-Wigner-tail effect of $D_s^\ast$ is in
agreement with the current LHCb measurement. We recommend the Belle-II and the
LHCb collaborations to restudy the processes $B^+\to \bar D^{\ast 0}\pi^+(K^+)
\to D^-\pi^+\pi^+(K^+)$ to reveal the structure of $D^{\ast 0}$ and the strong
decay $D^{\ast 0} \to D^+ \pi^-$.

15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph