# The 2009 Europhysics Conference on High Energy Physics

Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

## Trilepton production at the CERN LHC: SUSY Signals and Standard Model Backgrounds

Jul 16, 2009, 11:55 AM
15m
Large Lecture - Hall B (Kraków, Poland)

### Large Lecture - Hall B

#### Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Higgs and New Physics

### Speaker

Dr Edmond Berger (Argonne National Laboratory)

### Description

Events with three or more isolated leptons in the final state are known to be signatures of new physics phenomena at high energy collider physics facilities. Standard model sources of isolated trilepton final states include gauge boson pair production such as $WZ$ and $W\gamma^*$, and $t\bar{t}$ production. We demonstrate that leptons from heavy flavor decays, such as $b \to lX$ and $c \to lX$, provide sources of trileptons that can be orders-of-magnitude larger after cuts than other standard model backgrounds to new physics processes. We explain the physical reason heavy flavor backgrounds survive isolation cuts. We propose new cuts to control the backgrounds in the specific case of chargino plus neutralino pair production in supersymmetric models. After these cuts are imposed, we show that it should be possible to find at least a 4 sigma excess for supersymmetry parameter space point LM9 with 30 fb$^{-1}$ of integrated luminosity. This presentation is based on Phys. Rev. {\bf D78}, 034030 (2008) [e-Print: arXiv:0805.3720 [hep-ph]] by E.L. Berger and Z. Sullivan and subsequent work.

### Primary author

Dr Edmond Berger (Argonne National Laboratory)

 Slides