Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quasi parton distribution function and quasi generalized parton
  distribution of the pion meson in a spectator model   We study the leading-twist quasi parton distribution function (quasi-PDF) and
quasi generalize parton distribution (quasi-GPD) of the pion meson by using a
spectator model. We consider the case the quasi functions are defined via
inserting the matrix $\gamma^3$ in the spacial correlation functions. We obtain
the analytical expressions for the quasi-PDF and quasi-GPD. The numerical
results for them are calculated from the parameters obtained by fitting the
model results to the known parametrization. Particularly, we investigate the
hadron momentum dependence of the quasi functions as well as compare the quasi
distributions to the standard functions at different hadron momentum. We find
that in the region $x>0.2$, the quasi distribution are similar to the standard
distributions in size and shape when the hadron momentum is larger than $2$
GeV. Our study thus supports the idea of using quasi distributions to obtain
standard distributions.

13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys