Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The $B^+ \to J/\psi \omega K^+ $ reaction and $D^*\bar{D}^*$ molecular
  states   We study the $B^+ \to J/\psi \omega K^+ $ reaction, measured by the LHCb
collaboration, and show that it is driven by the presence of two resonances,
the $X(3940)$ and $X(3930)$, that are of molecular nature and couple most
strongly to $D^* \bar{D}^*$, but also to $J/\psi\omega$. Because of that, in
the $J/\psi\omega$ mass distribution we find a peak related to the excitation
of the resonances and a cusp with large strength at the $D^* \bar{D}^*$
threshold.

15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat