Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the $D^+_s \to \pi^+ \pi^+ \pi^-$ - nonresonant decay in the
  effective quark model with chiral symmetry   The partial widths of the decays $D^+_s \to \phi \pi^+$ and $D^+_s \to \pi^+
\pi^+ \pi^-$ - nonresonant are computed within the effective quark model with
chiral symmetry involving Heavy quark effective theory (HQET) and Chiral
perturbation theory at the quark level (CHPT)$_q$ with linear realization of
chiral U(3) x U(3) symmetry. It is shown that for the explanation of the
experimental probability of the $D^+_s \to \pi^+ \pi^+ \pi^-$ - nonresonant
decay one does not need to use unnaturally heavy light current quarks as has
been suggested in Ref.[1]. The life time of the $D^+_s$ - meson $\tau_{D^+_s} =
(0.59\pm 0.19) x 10^(-12) s$ is computed in good agreement with the
experimental one.

34
The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
3
The categories of this paper are: physics
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th