Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Hidden Charm Decay of $X(3872), Y(3940)$ and Final State Interaction
  Effects   We investigate whether the final state interaction (FSI) effect plays a
significant role in the large hidden charm decay width of X(3872) and Y(3940)
using a model. Our numerical result suggests (1) the FSI contribution to
$X(3872)\to J/\psi\rho $ is tiny; (2) $\Gamma[ Y(3940)\to
D\bar{D}^{*}+\text{h.c.}\to J/\psi\omega ]$ from FSI is around several keV, far
less than Belle's experimental value 7 MeV.

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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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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: nlin
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci