Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Semileptonic decays $D\to\eta\pi e^+\nu_e$ in the $a_0(980)$ region   The mechanism of the four-quark production of the light scalar isovector
four-quark state $a_0(980)$ in the $D\to\eta\pi e^+\nu_e$ decays is discussed.
It is shown that the characteristic features of the shape of the $\eta\pi$ mass
spectra expected in our scheme can serve as the indicator of the production
mechanism and internal structure of the $a_0(980)$ resonance.

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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
32
The categories of this paper are: atom-ph
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The categories of this paper are: econ
25
The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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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: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas