Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Back-to-back isolated photon-quarkonium production at the LHC and the
  transverse-momentum-dependent distributions of the gluons in the proton   The study of a quasi back-to-back isolated pair made of a heavy quarkonium,
such as a J/psi or a Upsilon, and a photon produced in proton-proton collisions
at the LHC, is probably the optimal way to get right away a first experimental
determination of two gluon transverse-momentum-dependent distributions (TMDs)
in an unpolarized proton, f1^g and h1^perp,g the latter giving the distribution
of linearly polarized gluons. To substantiate this, we calculate the
transverse-momentum-dependent effects that arise in the process under study and
discuss the feasibility of their measurements.

18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess