Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of the processes $\chi_{cJ} \to \Xi^- \bar{\Xi}^+$ and $\Xi^0
  \bar{\Xi}^0$   Using $448.1\times 10 ^6$ $\psi(3686)$ decays collected with the BESIII
detector at the BEPCII $e^+e^-$ storage rings, the branching fractions and
angular distributions of the decays $\chi_{cJ}\to\Xi^-\bar{\Xi}^+$ and
$\Xi^0\bar{\Xi}^0$ $(J = 0, 1, 2)$ are measured based on a
partial-reconstruction technique. The decays $\chi_{c1}\to\Xi^0\bar{\Xi}^0$ and
$\chi_{c2}\to\Xi^0\bar{\Xi}^0$ are observed for the first time with statistical
significances of 7$\sigma$ and 15$\sigma$, respectively. The results of this
analysis are in good agreement with previous measurements and have
significantly improved precision.

4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin