Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiative pi^pm gamma transitions of excited light-quark mesons in the
  covariant oscillator quark model   The COMPASS collaboration, as a part of their hadron spectroscopy program, is
going to measure the radiative decay widths of light-quark mesons via the
Primakoff reactions. In this letter we study the photon couplings of
light-quark q qbar states in the covariant oscillator quark model and evaluate
the transition rates for {rho(770), b_1(1235), a_1(1260), a_2(1320),
pi_2(1670), rho_3(1690), rho(1700)}^pm to pi^pm gamma, which are expected to be
measured by the COMPASS. Such photon couplings could be useful not only for
understanding the internal structures of observed light-quark mesons and their
quark-model classification but also for the ongoing experimental studies by
COMPASS.

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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph