Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Road to the Standard Grand Unified Theory   In this talk, we propose a GUT scenario in which doublet-triplet splitting is
naturally realized in SO(10) unification using the Dimopoulos-Wilczek mechanism
and the realistic mass matrices of quarks and leptons are obtained in a simple
way. For the neutrino sector, bi-maximal neutrino mixing angles are realized.
Moreover, the generic interaction is allowed, namely, all the terms which are
allowed by the symmetry are included in the scenario. Therefore, once we fix
the integer number charges of the anomalous U(1)_A symmetry, which plays an
essential role in the scenario, all the scales, GUT breaking scale, mass scales
of superheavy particles, are determined. The scenario can be extended into E_6
unification, in which a condition for suppression of flavor changing neutral
current (FCNC) is automatically satisfied.

20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc