Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for X(3872) in PbPb collisions and studies of its prompt
  production at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV   The first evidence for X(3872) production in relativistic heavy ion
collisions is reported. The X(3872) production is studied in lead-lead (PbPb)
collisions at a center-of-mass energy of $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV per
nucleon pair, using the decay chain X(3872) $\to$ J$/\psi\, \pi^+\pi^- \to$
$\mu^+\mu^-\pi^+\pi^-$. The data were recorded with the CMS detector in 2018
and correspond to an integrated luminosity of 1.7 nb$^{-1}$. The measurement is
performed in the rapidity and transverse momentum ranges $|y|$ $\lt$ 1.6 and 15
$\lt$ $p_\mathrm{T}$ $\lt$ 50 GeV$/c$. The significance of the inclusive
X(3872) signal is 4.2 standard deviations. The prompt X(3872) to $\psi$(2S)
yield ratio is found to be $\rho^\mathrm{PbPb} = $ 1.08 $\pm$ 0.49 (stat) $\pm$
0.52 (syst), to be compared with typical values of 0.1 for pp collisions. This
result provides a unique experimental input to theoretical models of the
X(3872) production mechanism, and of the nature of this exotic state.

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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
3
The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph