Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CP-phase effects on the effective neutrino mass $m_{ee}$ in the case of
  quasi-degenerate neutrinos   We study the possibility that the three mass states of the ordinary active
neutrinos actually split into pairs of quasi-degenerate states, with $\Delta
m^2_{kk'} \sim 10^{-12}$ eV$^2$ or less, as a result of mixing of active
neutrinos with sterile neutrinos. Although these quasi-degenerate pairs will
look in laboratory experiment identical to single active states, the CP phase
factors associated with active-sterile mixing might cause cancellations in the
effective electron neutrino mass $m_{ee}$ measured in the neutrinoless double
beta decay experiments thereby revealing the split nature of states.

27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol