Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Schematic model of generations   We propose a model of generations that has exactly three generations. This
model has several attractive features: There is a simple mechanism to produce
the CKM quark mixings and their neutrino analogs. There are definite
predictions for particles of much higher mass than the quarks and leptons of
the standard model, including the prediction of two-body decays without missing
mass for the higher mass particles. There is a natural dark matter particle. A
discussion of masses of the quarks suggests that the large mass differences
between the generations could have a qualitative explanation, and there could
be a simple way to make the $u$-$d$ mass difference negative, but the $c$-$s$
and $t$-$b$ mass differences positive. The model also suggests a completely new
scenario for the production, mass and decays of the Higgs meson that will be
analysed in a separate paper.

34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci