bennett magy 1. t wb @13 tev 2 neutrinos can’t be detected by the atlas detector, but we can...
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Bennett Magy
Top Partner Search
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TWb @13 TeV
Background Samples:
• W + jets• Z + jets• Singletop
Signal Samples:• 700 GeV• 900 GeV• 1100 GeV
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Neutrino Reconstruction
Neutrinos can’t be detected by the ATLAS detector, but we can still piece them back together
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Reconstruction EquationsWith MET, MET Phi, lepton information and what we know about the W boson, reconstruct the undetected Neutrino.
Currently analyzing six different methods to handle the case where the neutrino solution(s) is/are complex.
Compare how their reconstructions compare with truth
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Reconstruction Methods
“Real Only”:
“Colinear”:
“modColinear”:
“TMinuit”: Scale back with TMinuit. The goal is to minimize difference between reconstructed and standard .
“Rotation”: Rotate until the solution is real.
“scaleMET”: Scale back until the solution is real.
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Neutrino Pt Distribution
Resolution
RecoMea
nStd Dev
scaleMET 3.68 62.98
TMinuit 12.3
1 85.75
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Neutrino Energy Distribution
Resolution
Reco MeanStd Dev
scaleMET
27.65
197.74
TMinuit
-10.2
1152.1
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• TMinuit and scaleMET are the best reconstruction methods
• Neither clearly superior with respect to distance from truth
• Choose TMinuit since it is a faster method
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Conclusions
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Cut OptimizationHow do we choose our events?
Goal is to create “Signal Region”:• Signal: events
• Background: non- events that pass
selection.
• Make sure background doesn’t drown out
signal
Maximize Significance
Minimize Statistical Uncertainty
(Significance Eqn)
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8 TeV Cuts
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• “N-1” approach, perform all cuts except for the one being plotted
• Analyze significance curve
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Linear Method
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• Optimize several different cuts at once.
• Iterates through different levels of signal efficiency and measures significance.
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TMVA Method
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Significance Plots--- CutsGA : --------------------------------------------------- CutsGA : Cut values for requested signal efficiency: 0.92--- CutsGA : Corresponding background efficiency : 0.132506--- CutsGA : Transformation applied to input variables : None--- CutsGA : --------------------------------------------------- CutsGA : Cut[ 0]: 0.0478034 < DeltaR_lepnu <= 3.03565--- CutsGA : Cut[ 1]: 698542 < HT <= 1.61862e+10--- CutsGA : Cut[ 2]: 55725.3 < bjet_pt[0] <= 1.64192e+06--- CutsGA : Cut[ 3]: 13795.2 < bjet_pt[1] <= 1.22079e+06--- CutsGA : ------------------------------------------------
900 GeV
--- CutsGA : --------------------------------------------------- CutsGA : Cut values for requested signal efficiency: 0.91--- CutsGA : Corresponding background efficiency : 0.219705--- CutsGA : Transformation applied to input variables : None--- CutsGA : --------------------------------------------------- CutsGA : Cut[ 0]: 0.0557273 < DeltaR_lepnu <= 3.06343--- CutsGA : Cut[ 1]: 626159 < HT <= 1.63625e+07--- CutsGA : Cut[ 2]: 34421 < bjet_pt[0] <= 1.44751e+06--- CutsGA : Cut[ 3]: 18377.4 < bjet_pt[1] <= 1.00036e+06--- CutsGA : ------------------------------------------------
700 GeV
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Cut Results:
8 TeV Cuts HT Tightened
Σ=11.3Σ=10.1
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Cut Results: TMVA Selection
8 TeV Cuts TMVA Cuts
Σ=15.5Σ=10.1
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Cuts Comparison
TMVA CutsHT Tightened
Σ=15.5Σ=11.3
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TMVA Selection on 700 GeV
TMVA Cuts8 TeV Cuts
Σ=8.5 Σ=30.7(!)
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ROOT ntuple json Matplotlib Plots
Now available at:
/afs/cern.ch/work/b/bmagy/public/PyDataMC
PyDataMC
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Cultural Activities
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Special Thanks
Thanks to Prof. Tom Schwarz, Dr. Allison McCarn, Daniel Marley, Prof. Jean Krisch, Dr. Steven Goldfarb, Prof. Homer Neal, and the Lounsbery Foundation!
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