Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: JAM small-$x$ helicity phenomenology   We present the first-ever description the world data on the $g_1^{p,n}$
structure function at small Bjorken $x$ using evolution equations in $x$
derived from first principles QCD. This is a Monte-Carlo analysis within the
JAM global framework that allows us to fit all existing polarized DIS data
below $x<0.1$ as well as predict future measurements of small $x$ $g_1^{p,n}$
at the EIC. This is a necessary step in determining the quark helicity PDFs
and, ultimately, the quark contribution to the proton spin.

34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
16
The categories of this paper are: stat
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph