Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pion Parton Distributions in a non local Lagrangian   We use phenomenological nonlocal Lagrangians, which lead to non trivial forms
for the quark propagator, to describe the pion. We define a procedure, based on
the Dyson-Schwinger equations, for the calculation of the pion parton
distributions at low Q^2. The obtained parton distributions fulfill all the
wishful properties. Using a convolution approach we incorporate the composite
character of the constituent quarks in the formalism. We evolve, using the
Renormalization Group, the calculated parton distributions to the experimental
scale and compare favorably with the data and draw conclusions.

4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex