Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The quest for an electric dipole moment of the neutron   Until this day no electric dipole moment of the neutron (nEDM) has been
observed. Why it is so vanishing small, escaping detection in the last 50
years, is not easy to explain. In general it is considered as the most
sensitive probe for the violation of the combined symmetry of charge and parity
(CP). A discovery could shed light on the poorly understood matter/anti-matter
asymmetry of the universe. As nucleon it might one day help to distinguish
different sources of CP-violation in combination with measurements of the
electron and diamagnetic EDMs. This proceedings articles presents an overview
of the most important concepts in searches for an nEDM and presents a brief
overview of the world wide efforts.

36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph