Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New ambiguity in probing CP violation in neutrino oscillations   If neutrinos get mass via the seesaw mechanism the mixing matrix describing
neutrino oscillations can be effectively non-unitary. We show that in this case
the neutrino appearance probabilities involve a new CP phase, phi, associated
to non-unitarity. This leads to an ambiguity in extracting the "standard"
three--neutrino phase delta_CP, which can survive even after neutrino and
antineutrino channels are combined. Its existence should be taken into account
in the planning of any oscillation experiment aiming at a robust measurement of
delta_CP.

10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
33
The categories of this paper are: plasm-ph