Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atmospheric neutrino mixing and b-tau Unification   Extrapolating the tau and b masses in the MSSM tends to give for their ratio
at the GUT scale a number around 1.2, for most viable values \tan \beta, rather
than the minimal SU(5) prediction of 1. We suggest that this may be due to
large off-diagonal elements in the charged lepton mass matrix M_L that can also
explain the large atmospheric neutrino mixing angle. Several simple models with
definite predictions for m_{tau}/m_b(M_{GUT}) are presented.

2
The categories of this paper are: math
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci