Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon spin structure functions, considering target mass correction and
  higher twist effects at the NNLO accuracy and their transverse momentum
  dependence   Using recent and updated world data on polarized structure functions $g_1$
and $g_2$ we perform QCD analysis at the next-next-to-leading-order (NNLO)
accuracy. We include also target mass correction and higher twist effect to get
more precise results in our fitting procedure. To confirm the validity of our
fitting results several sum rules are examined and we do a comparison for them
with results from other models. In our analysis we employ Jacobi polynomials
approach to obtain analytical solutions of the DGLAP evolution equations for
parton distribution functions (PDFs). Using the extracted PDFs from our data
analysis as input we also compute the $x$- and $\mathbf{p}_{T}$-dependence of
some transverse momentum dependence (TMD) PDFs in polarized case, based on
covariant parton model. These functions are naively even time-reversal (T-even)
at twist-2 approximation. The results for TMDs are indicating proper and
acceptable behaviour with respect to what are presented in other literatures.

15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con