Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non local lagrangians(I): the pion   We define a family of non local and chirally symmetric low energy lagrangians
motivated by theoretical studies on Quantum Chromodynamics. These models lead
to quark propagators with non trivial momentum dependencies. We define the
formalism for two body bound states and apply it to the pion. We study the
coupling of the photon and W bosons with special attention to the
implementation of local gauge invariance. We calculate the pion decay constant
recovering the Goldberger-Treiman and the Gell-Mann-Oakes-Renner relations. We
recover a form of the axial current consistent with PCAC. Finally we study the
pion form factor and we construct the operators involved in its parton
distribution.

22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga