Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The 3D entangled structure of the proton; transverse degrees of freedom
  in QCD, momenta, spins and more   Light-front quantized quark and gluon states (partons) play a dominant role
in high energy scattering processes. Initial state hadrons are mixed ensembles
of partons, while produced pure partonic states appear as mixed ensembles of
hadrons. The transition from collinear hard physics to the 3D structure
including partonic transverse momenta is related to confinement which links
color and spatial degrees of freedom. We outline ideas on emergent symmetries
in the Standard Model and their connection to the 3D structure of hadrons.
Wilson loops, including those with light-like Wilson lines such as used in the
studies of transverse momentum dependent distribution functions (TMDs) may play
a crucial role here, establishing a direct link between transverse spatial
degrees of freedom and gluonic degrees of freedom.

13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci