Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Electroweak Model With Massive Neutrinos   In this paper, an electroweak model with massive neutrinos is proposed. The
symmetry of the model is $SU(2)_L \times U(1)_Y \times U(1)_M$. Because of the
mixing of neutrinos, the conversion of one lepton type to another is possible,
but many of those kind processes are of extremely small possibilities. The
total lepton-number conservation still holds in this model, so neutrinoless
double beta decay is prohibited. Though right-hand neutrinos are introduced
into the model, their coupling with matter fields is extremely small and
therefore they are much harder to be detected in experiments.

23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
2
The categories of this paper are: math
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ