Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $D^{\pm}D^{*\mp}$ Hadronic Atom as a Key to Revealing the $X(3872)$
  Mystery   The $X(3872)$, whose mass coincides with the $D^0\bar D^{*0}$ threshold, is
the most extended hadron object. Since its discovery in 2003, debates have
never stopped regarding its internal structure. We propose a new object, the
$X$ atom, which is the $D^\pm D^{*\mp}$ composite system with positive charge
parity and a mass of $(3879.89\pm0.07)$ MeV, formed mainly due to the Coulomb
force. We show that a null signal of the $X$ atom can be used to put a lower
limit on the binding energy of the $X(3872)$. From the current knowledge of the
$X(3872)$ properties, the production rate for the $X$ atom relative to the
$X(3872)$ in $B$ decays and at hadron colliders should be at least
$1\times10^{-3}$. New insights into the $X(3872)$ will be obtained through
studying the $X$ atom.

26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs