Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Leptonic Custodial Symmetry, Quantization of the Electric Charge and the
  Neutrino in the Standard Model   I study, in the leptonic sector, the role of the $SU(2)_V$ custodial symmetry
$\ti{\cal G}$ which was shown in ref. [1] to control the quantization of the
electric charge in the $J=0$ mesonic sector. The electroweak theory is
considered, according to ref. [2], as a purely vectorial model which interacts
with a ``hidden'' sector of composite scalars. $\ti{\cal G}$ can only be a
symmetry of the former if the neutrino is a Majorana particle; the latter
provides a dynamical modification of the leptonic weak couplings,
reconstructing those of the Standard Model with a massless Majorana neutrino.

12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an