Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiative decay width of the a2(1320)^- meson   Coherent pi^+pi^-pi^- production in the interactions of a beam of 600 GeV
pi^- mesons with C, Cu and Pb nuclei has been studied with the SELEX facility
(Experiment E781 at Fermilab). The a2(1320) meson signal has been detected in
the Coulomb (low q^2) region. The Primakoff formalism used to extract radiative
decay width of this meson yields Gamma=284+/-25+/-25 keV, which is the most
precise measurement to date.

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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph