Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for the rare decays $D\to h(h')e^+e^-$   We search for rare decays of $D$ mesons to hadrons accompany with an
electron-positron pair (h(h')$e^+e^-$), using an $e^+e^-$ collision sample
corresponding to an integrated luminosity of 2.93 fb$^{-1}$ collected with the
BESIII detector at $\sqrt{s}$ = 3.773 GeV. No significant signals are observed,
and the corresponding upper limits on the branching fractions at the $90\%$
confidence level are determined. The sensitivities of the results are at the
level of $10^{-5} \sim 10^{-6}$, providing a large improvement over previous
searches.

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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
3
The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
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The categories of this paper are: eess