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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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slide1

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

slide2

Basic Losses

More optimal

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

& CALSeal > 0

CPFGamProb > 0 & CALSeal > 0

Total

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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

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Total

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slide3

What the other PreFilters do

CALGamProb > 0.

TKRGamProb > 0.

Total

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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

slide4

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

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This will be the applied to Source & Diffuse

The large loss below 100 MeV not appropriate for Transient

slide5

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

slide6

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

slide7

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

slide8

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

slide9

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.

slide10

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

slide11

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

slide12

Source Class

AllProb Knob

Req. Transient Class

Use CT with CalTkrComboCut

.4 Hz - AllProb > .10 (!)

slide13

Source Class

Remaining Background: All = 7400 (.51 Hz)

E > 100 MeV = 4837 (.33 Hz)

Gamma and Background Spectra

slide14

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)

slide15

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)

slide16

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

slide17

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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