Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pion production in deeply virtual Compton scattering   Using a soft pion theorem based on chiral symmetry and a $\Delta(1232)$
resonance model we propose an estimate for the production cross section of low
energy pions in the deeply virtual Compton scattering (DVCS) process. In
particular, we express the $e p \to e \gamma \pi N$ processes in terms of
generalized parton distributions. We provide estimates of the contamination of
the $e p \to e \gamma p$ DVCS observables due to this associated pion
production processes when the experimental data are not fully exclusive, for a
set of kinematical conditions representative of present or planned experiments
at JLab, HERMES and COMPASS.

14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math