Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Signature of an $h_1$ state in the $J/\psi \to \eta h_1 \to \eta
  K^{*0}\bar{K}^{*0}$ decay   The BES data on the $J/\psi \to \eta K^{*0}\bar{K}^{*0}$ reaction show a
clear enhancement in the $K^{*0}\bar{K}^{*0}$ mass distribution close to the
threshold of this channel. Such an enhancement is usually a signature of a L=0
resonance around threshold, which in this case would correspond to an $h_1$
state with quantum numbers $I^G(J^{PC})=0^-(1^{+-})$. A state around $1800\
\text{MeV}$ results from the interaction of the $K^* \bar{K}^*$ using the local
hidden gauge approach. We show that the peak observed in $J/\psi \to \eta
K^{*0}\bar{K}^{*0}$ naturally comes from the creation of this $h_1$ state with
mass and width around $1830\ \text{MeV}$ and $110\ \text{MeV}$, respectively. A
second analysis, model independent, corroborates the first result, confirming
the relationship of the enhancement in the invariant mass spectrum with the
$h_1$ resonance.

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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
1
The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
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The categories of this paper are: patt-sol