Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Model of Yukawa Hierarchies   We present a model for the observed hierarchies among the Yukawa couplings of
the standard model in the context of an effective low energy theory with an
anomalous U(1) symmetry. This symmetry, a generic feature of superstring
compactification, is a remnant of the Green-Schwarz anomaly cancellation
mechanism. The gauge group is that of the standard model, augmented by X, the
anomalous U(1), and two family-dependent phase symmetries $Y^{(1)}$ and
$Y^{(2)}$. The correct hierarchies are reproduced only when $sin^2\theta_w=3/8$
at the cut-off. To cancel anomalies, right-handed neutrinos and other standard
model singlets must be introduced. Independently of the charges of the
right-handed neutrinos, this model produces the same neutrino mixing matrix and
an inverted hierarchy of neutrino masses. The heaviest is the electron neutrino
with a mass $\sim 1$ meV, and mixing of the order of $\lambda_c^3$ with each of
the other two neutrinos.

37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys