Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of a Neutral Structure near the $D\bar{D}^{*}$ Mass
  Threshold in $e^{+}e^{-}\to (D \bar{D}^*)^0\pi^0$ at $\sqrt{s}$ = 4.226 and
  4.257 GeV   A neutral structure in the $D\bar{D}^{*}$ system around the $D\bar{D}^{*}$
mass threshold is observed with a statistical significance greater than
10$\sigma$ in the processes $e^{+}e^{-}\rightarrow D^{+}D^{*-}\pi^{0}+c.c.$ and
$e^{+}e^{-}\rightarrow D^{0}\bar{D}^{*0}\pi^{0}+c.c.$ at $\sqrt{s}$ = 4.226 and
4.257 GeV in the BESIII experiment. The structure is denoted as
$Z_{c}(3885)^{0}$. Assuming the presence of a resonance, its pole mass and
width are determined to be ($3885.7^{+4.3}_{-5.7}$(stat)$\pm 8.4$(syst))
MeV/$c^{2}$ and ($35^{+11}_{-12}$(stat)$ \pm 15$(syst)) MeV, respectively. The
Born cross sections are measured to be $\sigma(e^{+}e^{-}\to
Z_{c}(3885)^{0}\pi^{0}, Z_{c}(3885)^{0} \to D\bar{D}^{*})=(77 \pm 13$(stat)$\pm
17$(syst)) pb at 4.226 GeV and ($47 \pm 9$(stat)$ \pm 10$(syst)) pb at 4.257
GeV. The ratio of decay rates $\frac{\mathcal{B}({Z_{c}(3885)^{0} \to
D^{+}D^{*-}+c.c.})}{\mathcal{B}({Z_{c}(3885)^{0} \to D^{0}\bar{D}^{*0}+c.c.})}$
is determined to be $0.96 \pm 0.18$(stat)$\pm 0.12$(syst), consistent with no
isospin violation in the process $Z_{c}(3885)^{0}\to D\bar{D}^*$.

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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat