Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of Twist-2 GTMDs in scalar-diquark model   We investigate the Generalized Transverse Momentum-dependent Distributions
(GTMDs) describing the parton structure of proton using the light-front
scalar-diquark model. In particular, we study the Wigner distributions for
unpolarized quark in unpolarized, longitudinally-polarized and
transversely-polarized proton. We also investigate the twist-2 GTMDs for
unpolarized quark $(\Gamma=\gamma^+)$ in scalar-diquark model.

10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol