# SUSY10

Aug 23 – 28, 2010
Bonn
Europe/Berlin timezone

## Effective Supersymmetry at the LHC

Aug 26, 2010, 4:12 PM
15m
Kl. Hörsaal Mathematik (Bonn)

Nussallee 12

### 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)

 Slides