Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Meson spectroscopy: too much excitement and too few excitations   We briefly review the general status of meson spectroscopy, especially in
light of the often made claim that there are too many observed resonances to be
accounted for as $q\bar{q}$ states. Also, the adequacy of the usual
Coulomb-plus-linear, alias "funnel", confining potential for reproducing the
experimental spectra of light, heavy-light, and heavy mesons is critically
analysed. Thus, many serious discrepancies are observed and discussed. As
possible causes, we suggest the neglect of unitarisation and other
coupled-channel effects, as well as the deficiency of the funnel potential
itself. In order to illustrate our alternative, "unquenched" approach, we
present some recent examples of successfully described puzzling mesonic
enhancements and resonances, such as the charmonium states X(4260) and X(3872),
as well as the axial-vector charmed mesons $D_1(2420)$, $D_1(2430)$,
$D_{s1}(2536)$, and $D_{s1}(2460)$.

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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: plasm-ph