Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A proton-pentaquark mixing and the~intrinsic charm model   A new interpretation of intrinsic charm phenomenon based on the assumption of
pentaquark $\left| u u d c\bar{c} \right>$ mixing with a proton is offered. The
structure function of the $c$-quark in the pentaquark is constructed. Mixing
different states is considered theoretically and using experiment data on
$D$-meson production and inclusive production of the hidden charm particles.

20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
1
The categories of this paper are: cs