Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutrino Masses within the Minimal Supersymmetric Standard Model   We investigate the possibility of accommodating neutrino masses compatible
with the MSW study of the Solar neutrino deficit within the minimal
supersymmetric Standard Model. The ``gravity-induced'' seesaw mechanism based
on an interplay of nonrenormalizable and renormalizable terms in the
superpotential allows neutrino masses $m_\nu\propto m_u^2/M_I$, with $m_u$ the
corresponding quark mass and $M_I\simeq 4\times10^{11}$ GeV, while at the same
time ensuring the grand desert with the gauge coupling unification at
$M_U\simeq 2\times10^{16}$ GeV. The proposed scenario may be realized in a
class of string vacua, {\it i.e.,} large radius ($R^2/\alpha '={\cal O}(20)$)
$(0,2)$ Calabi-Yau spaces. In this case $M_U^2=M_C^2/{\cal O} (2R^2/\alpha')$
and $M_I= {\cal O}(e^{-R^2/\alpha'})M_C$. Here $M_C=g\times 5.2\times
10^{17}$GeV is the scale of the tree level (genus zero) gauge coupling ($g$)
unification.

8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci