Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-spin asymmetry of $J/\psi$ production in $p$$+$$p$, $p$$+$Al, and
  $p$$+$Au collisions with transversely polarized proton beams at
  $\sqrt{s_{_{NN}}}=200$ GeV   We report the transverse single-spin asymmetries of $J/\psi$ production at
forward and backward rapidity, $1.2<|y|<2.2$, as a function of $J/\psi$
transverse momentum ($p_T$) and Feynman-$x$ ($x_F$). The data analyzed were
recorded by the PHENIX experiment at the Relativistic Heavy Ion Collider in
2015 from $p$$+$$p$, $p$$+$Al, and $p$$+$Au collisions with transversely
polarized proton beams at $\sqrt{s_{_{NN}}}=200$ GeV. At this collision energy,
single-spin asymmetries for heavy-flavor particle production of $p$$+$$p$
collisions provide access to the spin-dependent gluon distribution and
higher-twist correlation functions inside the nucleon, such as the gluon
Qiu-Sterman and trigluon correlation functions. Proton+nucleus collisions offer
an excellent opportunity to study nuclear effects on the correlation functions.
The data indicate negative asymmetries at the two-standard-deviation level in
the $p$$+$Au data for $p_T<2$ GeV/$c$ at both forward and backward rapidity,
while in $p$$+$$p$ and $p$$+$Al collisions the asymmetries are consistent with
zero within the range of experimental uncertainties.

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The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin