Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the eta'-meson mass using J/psi--> gamma eta'   We measure the mass of the eta' meson using psi(2S)--> pi+ pi- J/psi,
J/psi--> gamma eta' events acquired with the CLEO-c detector operating at the
CESR e+e- collider. Using three decay modes, eta'--> rho0 gamma, eta'--> pi+
pi- eta with eta--> gamma gamma, and eta'--> pi+ pi- eta with eta--> pi+ pi-
pi0, we find M(eta') = 957.793 +- 0.054 +- 0.036 MeV, in which the first
uncertainty is statistical and the second is systematic. This result is
consistent with but substantially more precise than the current world average.

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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: cmp-lg
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The categories of this paper are: comp-gas