Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theta-13 as a Probe of Mu-Tau symmetry for Leptons   Many experiments are being planned to measure the neutrino mixing parameter
$\theta_{13}$ using reactor as well as accelerator neutrino beams. In this
note, the theoretical significance of a high precision measurement of this
parameter is discussed. It is emphasized that it will provide crucial
information about different ways to understand the origin of large atmospheric
neutrino mixing and move us closer towards determining the neutrino mass
matrix. For instance if exact $\mu\leftrightarrow \tau$ symmetry in the
neutrino mass matrix is assumed to be the reason for maximal $\nu_\mu-\nu_\tau$
mixing, one gets $\theta_{13}=0$. Whether $\theta_{13}\simeq \sqrt{\Delta
m^2_{\odot}/\Delta m^2_A}$ or $\theta_{13}\simeq \Delta m^2_{\odot}/\Delta
m^2_A$ can provide information about the way the $\mu\leftrightarrow \tau$
symmetry breaking manifests in the case of normal hierarchy. We also discuss
the same question for inverted hierarchy as well as possible gauge theories
with this symmetry.

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The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th