Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Littlest Seesaw model from S4 x U(1)   We show how a minimal (littlest) seesaw model involving two right-handed
neutrinos and a very constrained Dirac mass matrix, with one texture zero and
two independent Dirac masses, may arise from $S_4\times U(1)$ symmetry in a
semi-direct supersymmetric model. The resulting CSD3 form of neutrino mass
matrix only depends on two real mass parameters plus one undetermined phase. We
show how the phase may be fixed to be one of the cube roots of unity by
extending the $S_4\times U(1)$ symmetry to include a product of $Z_3$ factors
together with a CP symmetry, which is spontaneously broken leaving a single
residual $Z_3$ in the charged lepton sector and a residual $Z_2$ in the
neutrino sector, with suppressed higher order corrections. With the phase
chosen from the cube roots of unity to be $-2\pi/3$, the model predicts a
normal neutrino mass hierarchy with $m_1=0$, reactor angle
$\theta_{13}=8.7^\circ$, solar angle $\theta_{12}=34^\circ$, atmospheric angle
$\theta_{23}=44^\circ$, and CP violating oscillation phase $\delta_{\rm
CP}=-93^\circ$, depending on the fit of the model to the neutrino masses.

5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess