Speaker
Mr
Andre Lessa
(University of Oklahoma)
Description
We investigate the phenomenology of Effective Supersymmetry (ESUSY)
models wherein electroweak-inos and wherein third generation scalars
have sub-TeV masses while first and second generation scalars lie in the
multi-TeV range. Such models ameliorate the SUSY flavor and CP problems
via a decoupling solution, while at the same time maintaining
naturalness. Toward this end, we assume independent GUT scale mass
parameters for third and first/second generation scalars and for the
Higgs scalars, in addition to $m_{1/2}$, $\tan\beta$ and $A_0$, and
require radiative electroweak symmetry breaking as usual. We scan the
parameter space using the Markov Chain Monte Carlo and pick out regions
that lead to an ESUSY spectrum, consistent with current constraints. The
lightest MSSM particle (LMP) is often, but not always the lightest
neutralino, and moreover, the thermal relic density of the neutralino
LMP is frequently very large. These models may phenomenologically be
perfectly viable if the LMP before nucleosynthesis decays into the axino
and SM particles. Dark matter is then an axion/axino mixture. At the
LHC, the most important production mechanisms are gluino production (for
$m_{1/2} \alt 700$~GeV) and third generation squark production, while
SUSY events rich in $b$-jets are the hallmark of the ESUSY scenario. We
examine the LHC phenomenology of ESUSY models by performing studies of
benchmark points with characteristic features.
Primary author
Mr
Andre Lessa
(University of Oklahoma)
Co-authors
Prof.
Howard Baer
(University of Oklahoma)
Prof.
Sabine Kraml
(LPSC)
Dr
Sezen Sekmen
(Florida State University)
Prof.
Xerxes Tata
(University of Hawaii)
