DOE REVIEW. Wisconsin at ATLAS (2) SUSY and Exotics. Yibin Pan. For the Wisconsin Task H. May 15, 2007. Physics Beyond The Standard Model. Our Wisconsin group has been doing wonderful work on the Standard Model Higgs (see Sau Lan’s presentation).
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Wisconsin at ATLAS (2)
SUSY and Exotics
For the Wisconsin Task H
May 15, 2007
A sample SUSY decay chain
LeptonsSuper Symmetry (SUSY) Searches
Our group is a major player in all these areas.
to be estimated
An Example SUSY “Discovery” Plot
Meff=∑|pTi| + ETmiss for 1 lepton+jets
* The “jets” requirement can be 2-jet/3-jet/4-jet/inclusive, etc.
Background estimation has to be data driven.
MT>80GeVExtraction of the W+jets Background: A Fully Data Driven Approach Developed By Wisconsin
* Separately, we also proposed a method for ttbar background estimation
Just one of the possible choices
Control Sample (ptj1>150, ptj3=0,1 lepton)
Signal selection samples:
“4jets”:ptj1,ptj2>100, ptj3,ptj4>50, 1 lepton
“3jets”:ptj1,ptj2>100, ptj3>50, 1 lepton
“inclusive”:S|ptj|>600, ptj3>0, 1 lepton
Significance Including bkg. Uncertainties @100pb-1
(Cuts: PTlep>20, S|PTjet|>600 , Ptj3>0, MT>80 GeV)
w/ Dwj, Dtt
30% better than previous analyses
SUSY Might Be Seen In The Very Early Days of LHC
0 and 1-Lepton+Jets(20 pb-1)
Narrow resonances for ee and mm, if they exist, should be seen during early ATLAS runs. (~1000 events for 10 fb-1)
Z’tt is not as narrow,
But still feasible
Heavy WW resonances(Higgs or Higgs-like particles)
700 GeV Signal
500 GeV Signal