Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of $\mathrm{D}$-meson production as a function of
  charged-particle multiplicity in proton--proton collisions at $\sqrt{s} = 13$
  TeV with ALICE at the LHC   Heavy quarks (charm and beauty) are produced in hard-scattering processes and
the study of their production in proton--proton (pp) collisions is an important
test for calculations based on perturbative Quantum Chromodynamics (pQCD).
Heavy-flavor production as a function of charged-particle multiplicity provides
insight into the processes occurring at the partonic level and the interplay
between the hard and soft particle production mechanisms in pp collisions.
  In this contribution, measurements of open heavy-flavor production as a
function of multiplicity, via the study of the $\mathrm{D}$-meson
self-normalized yields in pp collisions at the center-of-mass energy of
$\sqrt{s} = 13$ TeV is presented. The $\mathrm{D}$-meson self-normalized yield
is found to increase stronger than linearly with increasing charged-particle
multiplicity. The measurements are compared to theoretical model calculations,
and with the results at $\sqrt{s} = 7$ TeV.

28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio