Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutrino Oscillation based on the Mixings with a Heavy Right-Handed
  Neutrino   We study a consistent explanation for both deficits of solar neutrino and
atmospheric neutrino due to the neutrino oscillation induced by the mixing of
light neutrinos with a heavy right-handed neutrino. We propose such a
phenomenological neutrino mass matrix that realizes this scenario in the simple
three generation left- and right- handed neutrino framework. Although this
model contains only one nonzero mass eigenvalue $\sim$ 10 eV for these light
neutrino states at the first approximation level, it can be expected to explain
consistently both deficiency due to the appropriate higher order corrections. A
suitable hot dark matter candidate is naturally included in it as its own
feature.

4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs