Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: mu-tau Interchange symmetry and lepton mixing   We focus on the use of a mu-tau interchange symmetry to explain features of
lepton mixing, especially maximal atmospheric neutrino mixing. We review two
models which achieve this goal and are based on the seesaw mechanism and on the
soft breaking of the family-lepton-number symmetries. We also note that that
symmetry may be embedded in a generalized CP symmetry. We show that, in the
context of some of our models, arguments of naturalness may be used for
explaining the smallness of the mass ratio m_mu / m_tau.

22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th