Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of a new charmonium state in double charmonium production in
  e+ e- annihilation at \sqrt{s} ~ 10.6 GeV   We report the first observation of a new charmonium state at a mass of
$(3.943 \pm 0.006 \pm 0.006) {GeV}/c^2$. This state, called X(3940), is
observed in the process $e^+ e^- \to J/\psi X(3940)$ in the spectrum of masses
recoiling against a reconstructed $J/\psi$. We also observe the decay of the
X(3940) into $D^* \bar{D}$ and measure the intrinsic width of this state to be
less than $52 MeV/c^2$ at the 90% C.L. These results are obtained from a $350
fb^{-1}$ data sample collected with the Belle detector near the $\Upsilon(4S)$
resonance, at the KEKB asymmetric energy $e^+ e^-$ collider.

21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an