Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Abelian symmetries as the source of the small neutrino-related flavor
  parameters   There are four neutrino-related flavor parameters that have been measured:
The three mixing angles s_{23}, s_{12}, s_{13}, and the ratio of mass-squared
differences r_{23}. Of these, the first two are order one. On the other hand,
s_{13} and r_{23} can be either order-one parameters that are accidentally
somewhat small, or they are small for a reason, for example, they vanish in the
limit of a symmetry that is broken by small parameters. We show that in the
latter case, the Froggatt-Nielsen mechanism could explain the smallness of
s_{13} and r_{23} only if some order-one coefficients are as small as the
symmetry-breaking parameters. It is thus very unlikely that an Abelian symmetry
is responsible for the smallness of s_{13} and r_{23}.

23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics