Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perturbations to \mu-\tau\ symmetry in neutrino mixing   Many neutrino mixing scenarios that have \mu-\tau symmetry with \theta_{13}=0
are in disagreement with recent experimental results that indicate a nonzero
value for \theta_{13}. We investigate the effect of small perturbations on
Majorana mass matrices with \mu-\tau symmetry and derive analytic formulae for
the corrections to the mixing angles. We find that since m_1 and m_2 are nearly
degenerate, \mu-\tau symmetry mixing scenarios are able to explain the
experimental data with about the same size perturbation for most values of
\theta_{12}. This suggests that the underlying unperturbed mixing need not have
\theta_{12} close to the experimentally preferred value. One consequence of
this is that a new class of models with \mu-\tau symmetry is possible, with
unperturbed \theta_{12} equal to zero or 90 degrees for arbitrary unperturbed
\theta_{13}.

18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg