Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiatively Generated Neutrino Masses in SU(3)_L x U(1)_N Gauge Models   In SU(3)_L x U(1)_N gauge models for electroweak interactions, we discuss how
to implement a radiative mechanism of generating Majorana neutrino masses by
considering the property that the Higgs scalar, which has a coupling to a
charged lepton (\ell)-neutrino (\nu) pair, is naturally included. The mechanism
is shown to work in models with a heavy charged lepton, \omega^+, in a lepton
triplet (\nu, \ell, \omega^+) and with a heavy neutral lepton, N, in (\nu,
\ell, N). A minimal model with \ell and \ell^c in (\nu, \ell, \ell^c) together
with a sextet Higgs scalar suffers from a fine-tuning problem to suppress
tree-level neutrino masses.

31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom