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Pass 6: Event ClassesPass 6: Event Classes
Working DefinitionsWorking Definitions TRANSIENT: E > 100 MeV ~ 2 Hz. Maximize Aeff at low energy SOURCE: E> 100 MeV ~ .4 Hz. Maximize Aeff 500 MeV - 10 GeV DIFFUSE: E> 100 MeV ~ .1 Hz. Minimize High energy tail > 10 GeV
Will try to achieve a greater differentiation between Classes then was the case in Pass 5
The final chapter
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TKRShower > 0. TKRShower > 0. & TKRHeavies > 0.
The 2 TKR Topoplogy Filters designed to kill sneak-through conversions, Heavy Ions, and back-side entering range-outs
Basic LossesBasic LossesCPFGamProb > max(.05, .55- .3* (CTBBestLogEnergy - 1.)) & CALSeal > 0
More optimal
CPFGamProb > 0 & CALSeal > 0
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CALGamProb > 0. TKRGamProb > 0.
What the other PreFilters doWhat the other PreFilters do
The large losses in these Filters canBe compensated for by taking the ORTKRGamProb > 0. || CALGamProb > 0
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Default CPF Seal and Special Event Filter(TKRGamProb > 0 | CALGamProb > 0) &TKRHeavies > 0. & TKRShower > 0. &CPFGamProb > max(.05, .55- .3* (CTBBestLogEnergy - 1.)) &
CALSeal > 0.
This will be the applied to Source & DiffuseThe large loss below 100 MeV not appropriate for Transient
Default LossesDefault Losses
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Combining TKRGamProb with CALGamProbCombining TKRGamProb with CALGamProb
Pass 5 Pass 6
Pass 5 Cut variable: (2.*max(0.,TKRGamProb)/CTBBestLogEnergy + CALGamProb ) / (1 - .08*(CTBBestLogEnergy-1.)) Pass 6 Cut variable : 3.*(TKRGamProb + CALGamProb)/CTBBestLogEnergy
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ALL ProbALL Prob
This is another way of combining the Shower & Topology Information by way of a CT.This doesn't use the combined CALGamProb & TKRGamProb
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This CT uses CalTkrComboCut and this is the one that will be used!
CTs agree that the correlation between CALGamProb & TKRGamProb is a good discriminator
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Increase cut on CPFGamProb CPFGamProb > .2
Leaves 153781 Bkg (10.6 Hz)
(TKRGamProb < 0)set CALGamProb > .2
Where the Signal and BackgroundsWhere the Signal and Backgrounds are in the 2 GamProbsare in the 2 GamProbs
When events fail the TKR PreFilters
Scan CPFGamProbScan CPFGamProb
Scan CALGamProbScan CALGamProb
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(CALGamProb > 0 & TKRGamProb > 0)
Set (CALGamProb + TKRGamProb) > 1.
(CALGamProb < 0)
Set TKRGamProb > .2
When events fail the CAL PreFiltersWhen events fail the CAL PreFilters
Scan TKRGamProbScan TKRGamProb
When events Pass Both PreFiltersWhen events Pass Both PreFilters
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(CALGamProb < 0 & TKRGamProb < 0)
Nothing to rescue
Results: Bkg. Left = 29226 = 2.02 Hz Bkg. Above 100 MeV = 14676 = 1.02 Hz
Pass 6 Transient ClassPass 6 Transient ClassCPFGamProb > .2 & CALSeal > 0 &((TKRGamProb < 0 & CALGamProb > .1) | (TKRGamProb > .1 & CALGamProb < 0) |(TKRGamProb+CALGamProb > .5))
When events Fail Both PreFiltersWhen events Fail Both PreFilters
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Losses: ~ 25% below 100 MeVLosses: ~ 25% below 100 MeV
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Gamma and Background SpectraGamma and Background Spectra
For the next 2 Classes, only the CT based combination of TKR and CAL GamProbs will be used
One of the PreFilters Vetoes
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Source Class
Req. Transient Class
Use CT with CalTkrComboCut
.4 Hz - AllProb > .10 (!)
AllProb KnobAllProb Knob
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Remaining Background: All = 7400 (.51 Hz) E > 100 MeV = 4837 (.33 Hz)
Gamma and Background SpectraGamma and Background Spectra
Source ClassSource Class
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Diffuse ClassDiffuse Class
AllProb > .4 Leaves: All = 1860 (.13 Hz) E > 100 MeV = 1627 (.11 Hz)
(By far the hardest due to high energy residual backgrounds)
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ButBut….….E > 3000 MeV : 87 event (6.0 mHz)Raising AllProb cut to .55 yields 40 events
26 events have McTkr1DirErr > .01
10 Fail CPFGamProb > .08*CTBBestLogEnergy 6 have (AcdActiveDist3D > 0 & AcdActDistTileEnergy > 1.7) 1 has (AcdActiveDist3D > 0 & AcdActDistTileEnergy > .2 & Tkr1SSDVeto == 0)
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Leaves: All = 978 (.068 Hz) E > 100 MeV = 934 (.065 Hz)
No. Events > 3 GeV: 29 Events (2.0 mHz)
Applying these cuts results in
For Pass 5 this was 3 mHz.
This needs improvement!
AllProb > .4AllProb > .4
AllProb > .4 + CutsAllProb > .4 + Cuts
High Energy Residual BackgroundsHigh Energy Residual Backgrounds
Event Class ComparisonEvent Class Comparison
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SummarySummary Pass 6 improves on Pass 5 The basics for optimize Event Class
definitions are available Improvements needed to compensate for
mis-tracking at high energy
