Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge-conjugation symmetric complete impulse approximation for the pion
  electromagnetic form factor in the Covariant Spectator Theory   The pion form factor is calculated in the framework of the charge-conjugation
invariant Covariant Spectator Theory. This formalism is established in
Minkowski space and the calculation is set up in momentum space. In a previous
calculation we included only the leading pole coming from the spectator quark
(referred to as the relativistic impulse approximation). In this paper we also
include the contributions from the poles of the quark which interacts with the
photon and average over all poles in both the upper and lower half planes in
order to preserve charge conjugation invariance (referred to as the
$C$-symmetric complete impulse approximation). We find that for small pion mass
these contributions are significant at all values of the four-momentum transfer
$Q^2$ but, surprisingly, do not alter the shape obtained from the spectator
poles alone.

36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas