Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pion parton distribution functions with the nonrelativistic constituent
  quark model   We calculate the valence quark distribution functions of the $\pi$ meson
using the non-relativistic chiral constituent quark model. The $\pi$ wave
function is obtained by solving the two-body Schr\"odinger equation within the
framework of constituent quark model. We transform the $\pi$ wave function from
the rest frame to the light cone or infinite momentum frame based on the
Lorentz boost. The valence quark distributions at the initial evolution scale
are obtained. The QCD evolution are given with the DGLAP equations with
parton-parton recombination corrections. With tuning the valence up (down)
quark mass to 70 MeV, the calculated valence up quark distributions at $Q^2=20$
GeV$^2$ are in good agreement with the E615 experimental data. The structure
functions $\rm{F}_2^\pi(x,Q^2)$ of pion are also calculated which consist with
the H1 experimental data. The proposed mechanisms here could be also used to
study other hadrons.

27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int