Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prompt $\eta_c$ meson production at the LHC in the NRQCD with
  $k_T$-factorization   In the framework of the $k_T$-factorization, the prompt production of
$\eta_c$ mesons at the LHC conditions is studied. Our consideration is based on
the off-shell amplitudes for hard partonic subprocesses and on the
nonrelativistic QCD (NRQCD) formalism for the formation of bound states. We try
two latest parametrizations for noncollinear, or transverse momentum dependent
(TMD) gluon densities derived from the Catani-Ciafaloni-Fiorani-Marchesini
(CCFM) equation. We use the values of the nonperturbative matrix elements
obtained from a combined fit of the $\eta_c$ and $J/\psi$ differential cross
sections. Finally, we show an universal set of parameters that provides a
reasonable simultaneous description for all of the available data on the prompt
$J/\psi$ and $\eta_c$ production at the LHC.

30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org