1. SUSY Searches with Multileptons
Elliott Cheu, Caleb Lampen, Prolay Mal

2. SUSY Multilepton Search (Cheu, Lampen)
Search for SUSY decays with three or more leptons, jets and missing ET
Promising because of low backgrounds and good sensitivity
Contributions:
Early data analysis 34 pb-1: Validation of analysis and systematic studies.
ATLAS-COM-CONF
Full 2 fb-1 analysis: Trigger studies and fake rate studies
ATLAS-COM-CONF and ATLAS-COM-PHYS
Optimization using multivariate analysis: 2 fb-1
Caleb Lampen's thesis.
E. Cheu - The ATLAS Experiment 2 2

3. SUSY Multilepton Search
Trigger efficiencies
For EF_e20_medium using tag and probe method on Z to ee events
Weight map = f(Et, h, f) validated and used in the analysis
Three lepton MSUGRA limits
Parameter space exclusion will significantly increase with full 2011 data set

4. Light Charged Higgs Decays (Cheu, Mal)
In MSSM it is possible for mH < mt
t → bH
For tan b > 1, H→ tnt is favored
Our contributions:
Sensitivity study: With 1 fb-1 at 7 TeV, we should have siginificant improvement over FNAL
ATL-COM-PHYS
Data/MC study: 1 fb-1 study of important variables
ATL-COM-PHYS
Full Analysis: Fake rates and background studies for 1 fb-1 analysis
ATL-PHYS-INT

5. CSC Electronic Calibration
Our contributions: Cheu, Lampen, Leone, Mal
Develop and maintain calibration software and related procedures.
Develop database to store all data.
Develop monitoring tools to check validity of data and constants.
Check validity of calibration process.
In situ alignment of CSC chambers
Global χ2 alignment method
E. Cheu - The ATLAS Experiment

6. Large Synoptic Survey Telescope
Camera
UA building camera power supplies
First prototype layout done
UA also providing control software (Johns, Lei)
Weak Lensing
Map distribution of dark matter to distinguish models of Dark Energy
Our efforts:
Understand effects of photometric-z on Dark Energy signal
Postdoc: A. Abate – UA Funding