Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The X(3872) and other X,Y,Z Resonances as Hidden Charm Meson-Meson
  Molecules   We report on some ideas concerning the nature of the X(3872) resonance and
the need for approximately equal charged and neutral components of $D \bar{D}^*
+cc$. Then we discuss how some hidden charm states are obtained from the
interaction between vector mesons with charm and can be associated to some of
the charmonium-like X,Y,Z states. Finally we discuss how the nature of these
states could be investigated through different types of radiative decay.

19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics