Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sparticle Masses, $\mu $ Problem and Anomaly Mediated Supersymmetry
  Breaking   Within the MSSM framework and with purely anomaly mediated supersymmetry
breaking the slepton masses turn out to be tachyonic. We resolve this problem
by introducing an anomaly free U(1) gauge symmetry which provides positive
$D$-term contributions to sparticle masses squared that are flavor conserving
at one loop. Two realistic examples based on SU(5) are presented. With U(1)
spontaneously broken at a scale $\sim 10^{16}$ GeV, the right handed neutrinos
acquire masses $\stackrel{<}{_\sim}10^{14}$ GeV. This breaking scale of U(1)
also plays an important role in the proposed resolution of the MSSM $\mu $
problem.

36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th