Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A model of quark and lepton mixing   We propose a model of quark and lepton mixing based on the tetrahedral A(4)
family symmetry with quark-lepton unification via the tetra-colour Pati-Salam
gauge group SU(4)_{PS}, together with SU(2)_L x U(1)_R. The "tetra-model"
solves many of the flavour puzzles and remarkably gives ten predictions at
leading order, including all six PMNS parameters. The Cabibbo angle is
approximately given by 1/4, due to the tetra-vacuum alignment (1,4,2),
providing the Cabibbo connection between quark and lepton mixing. Higher order
corrections are responsible for the smaller quark mixing angles and CP
violation and provide corrections to the Cabibbo and lepton mixing angles and
phases. The tetra-model involves an SO(10)-like pattern of Dirac and heavy
right-handed neutrino masses, with the strong up-type quark mass hierarchy
cancelling in the see-saw mechanism, leading to a normal hierarchy of neutrino
masses with an atmospheric angle in the first octant of 40 +/- 1 degree, a
solar angle of 34 +/- 1 degree, a reactor angle of 9.0 +/- 0.5 degree,
depending on the ratio of neutrino masses m_2/m_3, and a Dirac CP violating
oscillation phase of 260 +/- 5 degrees.

14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph