Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of psi(2S) Decays to gamma p bar{p}, pi^0 p bar{p} and eta p
  bar{p} and Search for p bar{p} Threshold Enhancements   The decays of psi(2S) into gamma p bar{p}, pi^0 p bar{p} and eta p bar{p}
have been studied with the CLEO-c detector using a sample of 24.5 million
psi(2S) events obtained from e^+e^- annihilations at sqrt{s} = 3686 MeV. The
data show evidence for the excitation of several N^* resonances in p pi^0 and p
eta channels in pi^0 p bar{p} and eta p bar{p} decays, and f_2 states in gamma
p bar{p} decay. Branching fractions for decays of psi(2S) to gamma p bar{p},
pi^0 p bar{p} and eta p bar{p} have been determined. No evidence for p bar{p}
threshold enhancements was found in the reactions psi(2S)-> X p bar{p}, where X
= gamma, pi^0, eta. We do, however, find confirming evidence for a p bar{p}
threshold enhancement in J/psi-> gamma p bar{p} as previously reported by BES.

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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin