Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of psi(3770) --> gamma chi_c0   From e+e- collision data acquired with the CLEO-c detector at CESR, we search
for the non-DDbar decays psi(3770) -> gamma chi_cJ, with chi_cJ reconstructed
in four exclusive decays modes containing charged pions and kaons. We report
the first observation of such decays for J=0 with a branching ratio of
(0.73+-0.07+-0.06)%. The rates for different J are consistent with the
expectations assuming psi(3770) is predominantly a 1^3D_1 state of charmonium,
but only if relativistic corrections are applied.

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The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: econ