Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How to measure the linear polarization of gluons in unpolarized proton
  using the heavy-quark pair production   In recent papers [1,2], two new ways have been proposed to probe the linear
polarization of gluons in unpolarized proton: using the azimuthal asymmetries
and Callan-Gross ratio in heavy-quark pair leptoproduction, $lN\rightarrow
l^{\prime}Q\bar{Q}X$. In this talk, we discuss in details the sensitivity of
the QCD predictions for the azimuthal $\cos \varphi$ and $\cos 2\varphi$
asymmetries to the contribution of linearly polarized gluons inside unpolarized
proton, where the azimuth $\varphi$ is the angle between the lepton scattering
plane $(l,l^{\prime})$ and the heavy quark production plane $(N,Q)$. Our
analysis shows that the azimuthal distributions under consideration vary from 0
to 1 depending on the transverse-momentum dependent gluonic counterpart of the
Boer-Mulders function, $h_{1}^{\perp g}$. We conclude that the $\cos \varphi$
and $\cos 2\varphi$ asymmetries in heavy-quark pair production in DIS processes
are predicted to be large in wide kinematic ranges and sensitive to the
contribution of linearly polarized gluons.

10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph