Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quark-Lepton Complementarity in Unified Theories   As pointed out by many authors, recent observations are consistent with an
intriguing relation between the Cabibbo angle $\theta_C$ and the solar neutrino
mixing angle $\theta_{12}$, namely $\theta_{12} \simeq \pi/4 - \theta_C$. Such
quark-lepton complementarity (QLC) may be a signal of an underlying
quark-lepton unification at short distances. We discuss possible ways to
realize this relation in realistic quark-lepton unification theories by
identifying a minimal set of operators that lead to QLC while remaining
consistent with other known data. The purpose of this paper is to present the
first elements of a unified model at the GUT scale capable of predicting the
QLC relation. A generic prediction of our proposed class of models is the new
relation for the lepton mixing angle $\theta_{13} \simeq \theta_C$, which
allows these models to be confirmed or excluded by the current generation of
neutrino oscillation experiments.

18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph