Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of the Doubly Cabibbo-Suppressed Decays $D^+\to
  K^+\pi^0\pi^0$ and $D^+\to K^+\pi^0\eta$   By analyzing $e^+e^-$ annihilation data corresponding to an integrated
luminosity of $2.93\,\rm fb^{-1}$ collected at the center-of-mass energy of
3.773\,GeV with the BESIII detector, we report the first observations of the
doubly Cabibbo-suppressed decays $D^+\to K^+\pi^0\pi^0$ and $D^+\to
K^+\pi^0\eta$. The branching fractions of $D^+\to K^+\pi^0\pi^0$ and $D^+\to
K^+\pi^0\eta$ are measured to be $(2.1 \pm 0.4_{\rm stat} \pm 0.1_{\rm
syst})\times 10^{-4}$ and $(2.1 \pm 0.6_{\rm stat} \pm 0.1_{\rm syst})\times
10^{-4}$ with statistical significances of 8.0$\sigma$ and 5.0$\sigma$,
respectively. In addition, we search for the subprocesses $D^+\to
K^{*}(892)^{+}\pi^0$ and $D^+\to K^{*}(892)^{+}\eta$ with $K^{*}(892)^+\to
K^+\pi^0$. The branching fraction of $D^+\to K^{*}(892)^{+}\eta$ is determined
to be $({4.7^{+1.9}_{-1.6}}_{\rm stat}\pm0.2_{\rm syst})\times10^{-4}$, with a
statistical significance of 3.3$\sigma$. No significant signal for $D^+\to
K^{*}(892)^{+}\pi^0$ is found and we set an upper limit on the branching
fraction of this decay at the 90\% confidence level to be $4.5\times10^{-4}$.

31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
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The categories of this paper are: stat
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg