Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A study of the decays of $S-$wave $\bar D^\ast K^\ast$ hadronic
  molecules: the scalar $X_0(2900)$ and its spin partners $X_{J(J=1,2)}$   In this work, we investigated the decays of the fully open-flavor tetraquark
state $X_0(2900)$ which was observed by the LHCb Collaboration very recently.
Here, the $X_0(2900)$ was assigned as a $S-$wave $\bar D^\ast K^\ast$ hadronic
molecule with $I=0$, and the effective lagrangian approach was applied to
estimate the partial decay widths. Moreover, we also predicted the decay
behaviors of the other unobserved $X_{J(J=1,2)}$, which were the spin partners
of the $X_0(2900)$ in the $S-$wave $\bar D^\ast K^\ast$ picture. It was pointed
out that the $X_1$ state with $I=0$ was a broad state with the width more than
one hundred MeV, while another $X_2$ state with $I=0$ was a narrow state with
the width approaching half of that for the $X_0(2900)$. In addition, our
results also showed that the $\bar D^\ast K$ mode was expected to be the
dominant decay mode for both $X_1$ and $X_2$. Searching for those unobserved
$X_{J(J=1,2)}$ in the future experiments might be helpful to understand the
nature of $X_0(2900)$.

8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc