Speaker
Marek Olechowski
(University of Warsaw)
Description
We investigate supersymmetric SO(10) GUT model with $\mu<0$.
The requirements of top-bottom-tau Yukawa unification,
correct radiative electroweak symmetry breaking and
agreement with the present experimental data may be
met when the soft masses of scalars and gauginos are
non-universal. We show how appropriate non-universalities
can easily be obtained in the SO(10) GUT broken to the
Standard Model. In many supersymmetric models it is quite
difficult to have values of BR$(b\to s\gamma)$ and
$(g-2)_\mu$ simultaneously in
good agreement with the experimental data. We discuss how
such agreement can be achieved in our model with $\mu<0$.
In the region of the parameter space preferred by our analysis
there are two main mechanisms leading to the LSP relic
abundance consistent with the WMAP results. One is the
coannihilation with the stau and the second is the resonant
annihilation via exchange of the $Z$ boson or the light Higgs
scalar. A very interesting feature of SO(10) models with
negative $\mu$ is that they typically predict sparticle spectra
much lighter than in models with positive $\mu$.
Author
Marek Olechowski
(University of Warsaw)
