Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recent results in high-energy longitudinal polarized proton-proton
  collisions at 200GeV at RHIC   We report on recent results of the longitudinal double-spin asymmetry A_LL
from the STAR and PHENIX experiments. Data were collected in longitudinally
polarized proton-proton collisions at a center-of-mass energy of 200 GeV. The
results added new constraints to the polarized gluon distribution function g(x)
with the probed x range of 0:02 < x < 0:3. The results lead to the importance
of probing small x.

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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math