Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Does the enhancement observed in $\gamma\gamma\to D\bar{D}$ contain two
  $P$-wave higher charmonia?   Solved is a new puzzle raised by the observation of an enhancement structure
Z(3930) in $\gamma\gamma\to D\bar{D}$. If categorizing Z(3930) as
$\chi_{c2}(2P)$ suggested by Belle and BaBar, we must explain why
$\chi_{c0}(2P)$ dominantly decaying into $D\bar{D}$ is missing in the
$D\bar{D}$ invariant mass spectrum. In this work, we propose that the Z(3930)
enhancement structure may contain two $P$-wave higher charmonia
{$\chi_{c0}(2P)$} and $\chi_{c2}(2P)$. We show that this assumption is
supported by our analysis of the $D\bar{D}$ invariant mass spectrum and
$\cos\theta^\ast$ distribution of $\gamma\gamma\to D\bar{D}$. This observation
would not only provide valuable information of two P-wave higher charmonia
$\chi_{c0}(2P)$ and $\chi_{c2}(2P)$, but also serve as the crucial test of our
novel proposal to the observed enhancement structure Z(3930), especially at the
forthcoming BelleII and the approved SuperB.

11
The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci