Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large mixing, family structure, and dominant block in the neutrino mass
  matrix   A possible connection between the flavour structure of the charged fermions
and the large $\nu_\mu-\nu_\tau$ mixing motivates an ansatz for the neutrino
mass matrix with a dominant block. We distinguish between a general form and
the specific forms of the ansatz, and concentrate on the cases of
phenomenological interest. The general form can incorporate an observable
amount of CP violation in the leptonic sector. Only specific forms can
incorporate the Mikheyev-Smirnov-Wolfenstein solutions for solar neutrinos,
with small or large mixing angles. Other specific variants explain the Los
Alamos neutrino anomaly, or provide a two-neutrino hot dark matter component.

11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph