Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exclusive $D_{s} \to (\eta,\eta^{\prime}) l \nu$ decays in light cone
  QCD   Probing the $\bar ss$ content of the $\eta$ and $\eta'$ mesons and
considering mixing between these states as well as gluonic contributions, the
form factors responsible for semileptonic $D_s \to (\eta, \eta') l \nu$
transitions are calculated via light cone QCD sum rules. Corresponding
branching fractions and their ratio for different mixing angles are also
obtained. Our results are in a good consistency with experimental data as well
as predictions of other nonperturbative approaches.

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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: nlin
1
The categories of this paper are: cs
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The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
3
The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas