Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Right-handed neutrino dark matter in the classically conformal U(1)'
  extended Standard Model   We consider the dark matter (DM) scenario in the context of the classically
conformal U(1)' extended standard model (SM), with three right-handed neutrinos
(RHNs) and the U(1)' Higgs field. The model is free from all the U(1)' gauge
and gravitational anomalies in the presence of the three RHNs. We introduce a
$Z_2$-parity in the model, under which an odd-parity is assigned to one RHN,
while all the other particles is assigned to be $Z_2$-even, and hence the
$Z_2$-odd RHN serves as a DM candidate. In this model, the U(1)' gauge symmetry
is radiatively broken through the Coleman-Weinberg mechanism, by which the
electroweak symmetry breaking is triggered. There are three free parameters in
our model, the U(1)' charge of the SM Higgs doublet ($x_H$), the new U(1)'
gauge coupling ($g_X$), and the U(1)' gauge boson ($Z'$) mass ($m_{Z'}$), which
are severely constrained in order to solve the electroweak vacuum instability
problem, and satisfy the LHC Run-2 bounds from the search for $Z'$ boson
resonance. In addition to these constraints, we investigate the RHN DM physics.
Because of the nature of classical conformality, we find that a RHN DM pair
mainly annihilates into the SM particles through the $Z'$ boson exchange. This
is the so-called $Z'$-portal DM scenario. Combining the electroweak vacuum
stability condition, the LHC Run-2 bounds, and the cosmological constraint from
the observed DM relic density, we find that all constrains complementarily work
to narrow down the allowed parameter regions, and, especially, exclude $m_{Z'}
\lesssim 3.5$ TeV. For the obtained allowed regions, we calculate the
spin-independent cross section of the RHN DM with nucleons. We find that the
resultant cross section well below the current experimental upper bounds.

22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys