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Looking in gamma_ana.txt, I found the exact cuts that Eric was using. Namely, the prefilters that were being applied before the cut efficiencies were evaluated. I've listed them here for completeness. One slightly troubling detail is the dependence on CTBCore > 0.1 (which has not yet been defined in the Pass8 analysis). Another is that the irreducible background filter does not seem to cut out the Earth10 photons which come standard in the background mix.

nSig

nBkg

~9x10^5

~4x10^6

Name

Purpose

Gamma Efficiency

Bkg Efficiency

Cut

IrrFilter

Remove irreducible bkg events

0%

13%

Code Block
((McZDir < -.2 && McId < 20) | (McZDir < .1 & McId > 20))
&& McAcdZEnter > 100 && McCharge !=0 && McTHPosHitOthers < 6

TkrCalCore

Take only "good" events

6.2%

2.2%

Code Block
TkrNumTracks>0 && CalEnergyRaw > 5 && CalCsIRLn>4 && CTBCORE>0.1

AcdEngFilter

Only events with moderate signal in the ACD

0%

47%

Code Block
(AcdTotalEnergy+AcdRibbonEnergy<0.05) && McZDir > 0

Prefilter

Only select relevant events

6.2%

1.2%

Code Block
(TkrCalCore && !(IrrFilter) && !(AcdEngFilter)

...

After applying the prefilters (which cut out a large portion of un-reconstructable events), I apply the ACD background rejection cuts, omitting the CT analysis to the files that I generated with Eric's scripts. I've also listed, in parentheses, the background efficiency removing the Earth10 photon contamination.

Name

Purpose

Gamma Efficiency

Bkg Efficiency

Cut

BasicTileCut

Reject events with track pointing at struck tile.

95.2%

7.85 (7.85% 37)%

Code Block
(Tkr1SSDVeto == 0 && AcdTkr1ActiveDist > -16 && 
AcdTkr1ActDistTileEnergy > .4)

RibbonCut

Reject events with track pointing at struck ribbon.

94.9%

7.43% 43 (6.95)%

Code Block
(AcdRibbonActDist > -(2 +350/sqrt(max(20,CTBBestEnergy))) && 
Tkr1SSDVeto < 3 && AcdRibbonEnergy > .05 )

TotalTileEnergyCut

Reject events with excess ACD total energy.

89.3%

1.17% 17 (1.04)%

Code Block
(AcdTotalTileEventEnergyRatio > .8 || (AcdTkr1ActiveDistENorm > -300 && 
AcdTotalTileEventEnergyRatio > max(.005, .1 - .0001*AcdTkr1ActiveDistENorm)))

CornerCut

Reject events in the corner gap of the ACD.

88.4%

1.15 (1.15% 03)%

Code Block
((Tkr1LATEdge/1.5) ^ 2 + (AcdCornerDocaENorm - 10)^ 2 < 3800 || 
(Tkr1LATEdge < 80 && abs(AcdCornerDocaENorm-2) < 4)) && Tkr1SSDVeto < 3

TileEdgeCut

Reject events at tile edges with decreased signal.

88.3%

1.15 (1.15% 03)%

Code Block
(abs(AcdTkr1ActiveDistENorm) < 15 && AcdTotalTileEventEnergyRatio > .005)

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