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

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Pass 6 event classes

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


Pass 6 event classes

Basic Losses

More optimal

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

& CALSeal > 0

CPFGamProb > 0 & CALSeal > 0

Total

Thin

Thick

Total

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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

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Pass 6 event classes

What the other PreFilters do

CALGamProb > 0.

TKRGamProb > 0.

Total

Thin

Thick

Total

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Total

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The large losses in these Filters can

Be compensated for by taking the OR

TKRGamProb > 0. || CALGamProb > 0


Pass 6 event classes

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


Pass 6 event classes

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


Pass 6 event classes

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


Pass 6 event classes

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


Pass 6 event classes

Where the Signal and Backgrounds

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


Pass 6 event classes

When events fail the CAL PreFilters

(CALGamProb < 0)

Scan TKRGamProb

Set TKRGamProb > .2

When events Pass Both PreFilters

(CALGamProb > 0 & TKRGamProb > 0)

Set (CALGamProb + TKRGamProb) > 1.


Pass 6 event classes

When events Fail Both PreFilters

(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


Pass 6 event classes

Losses: ~ 25% below 100 MeV

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


Pass 6 event classes

Source Class

AllProb Knob

Req. Transient Class

Use CT with CalTkrComboCut

.4 Hz - AllProb > .10 (!)


Pass 6 event classes

Source Class

Remaining Background: All = 7400 (.51 Hz)

E > 100 MeV = 4837 (.33 Hz)

Gamma and Background Spectra


Pass 6 event classes

Diffuse Class

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

AllProb > .4

Leaves: All = 1860 (.13 Hz)

E > 100 MeV = 1627 (.11 Hz)


Pass 6 event classes

But….

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)


Pass 6 event classes

High Energy Residual Backgrounds

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


Pass 6 event classes

  • Summary

  • 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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