Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A New Approach to the Family Structure   In this letter, we introduce a new approach to formulate the family structure
of the standard model. Trying to mimic the highly contrained representation
structure of the standard model while extending the symmetry, we propose a
$SU(4)\otimes SU(3)\otimes SU(2)\otimes U(1)$ symmetry with a SM-like chiral
spectra basically "derived" from the gauge anomaly constraints. Embedding the
SM leads to $SU(4)_A\otimes SU(3)_C\otimes SU(2)_L\otimes U(1)_X$ models, which
upon the $SU(4)_A\otimes U(1)_X \longrightarrow U(1)_Y$ symmetry breaking,
gives the three families naturally as a result. A specific model obtained from
the approach is illustrated. The model, or others from our approach, holds
promise of a very interesting phenomenology. We sketch some of the results
here. An interesting possiblity of supersymmetrizing the model with the
EW-Higgses already in the spectrum is noted. A comparison with other approaches
is also discussed.

33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess