Pass 6: Event Classes
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Pass 6: Event Classes. The final chapter. Working 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.

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Pass 6: Event Classes

The final chapter

  • Working 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


Basic Losses

More optimal

CPFGamProb > max(.05, .55- .3* (CTBBestLogEnergy - 1.))

& CALSeal > 0

CPFGamProb > 0 & CALSeal > 0

Total

Thin

Thick

Total

Thin

Thick

The 2 TKR Topoplogy Filters designed to kill sneak-through conversions, Heavy Ions, and back-side entering range-outs

TKRShower > 0. & TKRHeavies > 0.

TKRShower > 0.

Total

Thin

Thick

Total

Thin

Thick


What the other PreFilters do

CALGamProb > 0.

TKRGamProb > 0.

Total

Thin

Thick

Total

Thin

Thick

Total

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Thick

The large losses in these Filters can

Be compensated for by taking the OR

TKRGamProb > 0. || CALGamProb > 0


Default CPF Seal and Special Event Filter

(TKRGamProb > 0 | CALGamProb > 0) &

TKRHeavies > 0. & TKRShower > 0. &

CPFGamProb > max(.05, .55- .3* (CTBBestLogEnergy - 1.)) &

CALSeal > 0.

Default Losses

Total

Thin

Thick

This will be the applied to Source & Diffuse

The large loss below 100 MeV not appropriate for Transient


Combining TKRGamProb with CALGamProb

Pass 6

Pass 5

Pass 5 Cut variable: (2.*max(0.,TKRGamProb)/CTBBestLogEnergy + CALGamProb ) / (1 - .08*(CTBBestLogEnergy-1.))

Pass 6 Cut variable : 3.*(TKRGamProb + CALGamProb)/CTBBestLogEnergy


ALL Prob

This is another way of combining the Shower & Topology Information by way of a CT.

This doesn't use the combined CALGamProb & TKRGamProb


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


Where the Signal and Backgrounds used!

are in the 2 GamProbs

Scan CPFGamProb

Increase cut on CPFGamProb

CPFGamProb > .2

Leaves 153781 Bkg

(10.6 Hz)

Scan CALGamProb

When events fail the TKR PreFilters

(TKRGamProb < 0)

set CALGamProb > .2


When events fail the CAL PreFilters used!

(CALGamProb < 0)

Scan TKRGamProb

Set TKRGamProb > .2

When events Pass Both PreFilters

(CALGamProb > 0 & TKRGamProb > 0)

Set (CALGamProb + TKRGamProb) > 1.


When events Fail Both PreFilters used!

(CALGamProb < 0 & TKRGamProb < 0)

Nothing to rescue

Pass 6 Transient Class

CPFGamProb > .2 & CALSeal > 0 &

((TKRGamProb < 0 & CALGamProb > .1) |

(TKRGamProb > .1 & CALGamProb < 0) |

(TKRGamProb+CALGamProb > .5))

Results: Bkg. Left = 29226 = 2.02 Hz

Bkg. Above 100 MeV = 14676 = 1.02 Hz


Losses: ~ 25% below 100 MeV used!

Gamma and Background Spectra

Total

Thin

Thick

For the next 2 Classes, only the CT based combination of TKR and CAL GamProbs will be used

One of the PreFilters Vetoes


Source Class used!

AllProb Knob

Req. Transient Class

Use CT with CalTkrComboCut

.4 Hz - AllProb > .10 (!)


Source Class used!

Remaining Background: All = 7400 (.51 Hz)

E > 100 MeV = 4837 (.33 Hz)

Gamma and Background Spectra


Diffuse Class used!

(By far the hardest due to high energy residual backgrounds)

AllProb > .4

Leaves: All = 1860 (.13 Hz)

E > 100 MeV = 1627 (.11 Hz)


But used!….

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)


High Energy Residual Backgrounds used!

Applying these cuts results in

AllProb > .4

Leaves: All = 978 (.068 Hz)

E > 100 MeV = 934 (.065 Hz)

No. Events > 3 GeV: 29 Events (2.0 mHz)

AllProb > .4 + Cuts

For Pass 5 this was 3 mHz.

This needs improvement!

Event Class Comparison


  • Summary used!

  • 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


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